Kami dapat menghapus batasan FOREIGN KEY dari kolom tabel yang ada dengan menggunakan kata kunci DROP bersama dengan pernyataan ALTER TABLE Show
SintaksisALTER TABLE table_name DROP FOREIGN KEY constraint_name Di sini nama batasan adalah nama batasan kunci asing yang kami terapkan saat membuat tabel. Jika tidak ada nama kendala yang ditentukan maka MySQL akan memberikan nama kendala yang dapat diperiksa dengan pernyataan SHOW CREATE TABLE Baca "Cara Menginstal MySQL dan Memulai" tentang cara menginstal, menyesuaikan, dan memulai dengan MySQL Ringkasan Perintah MySQL yang Digunakan dalam Tutorial iniUntuk sintaks terperinci, periksa manual MySQL "Sintaksis Pernyataan SQL" @ http. //dev. mysql. com/doc/refman/5. 5/en/sql-sintaks. html Contoh untuk Pemula (Tapi BUKAN untuk boneka)Server database MySQL berisi banyak database (atau skema). Setiap database terdiri dari satu atau lebih tabel. Tabel terdiri dari kolom (atau field) dan baris (record) Kata kunci dan perintah SQL TIDAK peka huruf besar-kecil. Untuk kejelasan, mereka ditampilkan dalam huruf besar. Nama atau pengidentifikasi (nama database, nama tabel, nama kolom, dll. ) sensitif huruf besar-kecil di beberapa sistem, tetapi tidak di sistem lain. Oleh karena itu, yang terbaik adalah memperlakukan pengidentifikasi sebagai case-sensitive TAMPILKAN DATABASEAnda dapat menggunakan mysql> SELECT name, price FROM products WHERE price < 1.0; +-----------+-------+ | name | price | +-----------+-------+ | Pencil 2B | 0.48 | | Pencil 2H | 0.49 | +-----------+-------+ 2 rows in set (0.00 sec) mysql> SELECT name, quantity FROM products WHERE quantity <= 2000; +-----------+----------+ | name | quantity | +-----------+----------+ | Pen Black | 2000 | +-----------+----------+ 1 row in set (0.00 sec)_6 untuk membuat daftar semua database yang ada di server mysql> SHOW DATABASES; +--------------------+ | Database | +--------------------+ | information_schema | | mysql | | performance_schema | | test | ........ Basis data " mysql> SELECT name, price FROM products WHERE price < 1.0; +-----------+-------+ | name | price | +-----------+-------+ | Pencil 2B | 0.48 | | Pencil 2H | 0.49 | +-----------+-------+ 2 rows in set (0.00 sec) mysql> SELECT name, quantity FROM products WHERE quantity <= 2000; +-----------+----------+ | name | quantity | +-----------+----------+ | Pen Black | 2000 | +-----------+----------+ 1 row in set (0.00 sec)_7", " mysql> SELECT name, price FROM products WHERE price < 1.0; +-----------+-------+ | name | price | +-----------+-------+ | Pencil 2B | 0.48 | | Pencil 2H | 0.49 | +-----------+-------+ 2 rows in set (0.00 sec) mysql> SELECT name, quantity FROM products WHERE quantity <= 2000; +-----------+----------+ | name | quantity | +-----------+----------+ | Pen Black | 2000 | +-----------+----------+ 1 row in set (0.00 sec)8" dan " mysql> SELECT name, price FROM products WHERE price < 1.0; +-----------+-------+ | name | price | +-----------+-------+ | Pencil 2B | 0.48 | | Pencil 2H | 0.49 | +-----------+-------+ 2 rows in set (0.00 sec) mysql> SELECT name, quantity FROM products WHERE quantity <= 2000; +-----------+----------+ | name | quantity | +-----------+----------+ | Pen Black | 2000 | +-----------+----------+ 1 row in set (0.00 sec)9" adalah basis data sistem yang digunakan secara internal oleh MySQL. Database " mysql> SELECT * FROM products WHERE quantity >= 5000 AND name LIKE 'Pen %'; +-----------+-------------+----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+----------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | | 1002 | PEN | Pen Blue | 8000 | 1.25 | +-----------+-------------+----------+----------+-------+ mysql> SELECT * FROM products WHERE quantity >= 5000 AND price < 1.24 AND name LIKE 'Pen %'; +-----------+-------------+---------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+---------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | +-----------+-------------+---------+----------+-------+ mysql> SELECT * FROM products WHERE NOT (quantity >= 5000 AND name LIKE 'Pen %'); +-----------+-------------+-----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+-----------+----------+-------+ | 1003 | PEN | Pen Black | 2000 | 1.25 | | 1004 | PEC | Pencil 2B | 10000 | 0.48 | | 1005 | PEC | Pencil 2H | 8000 | 0.49 | +-----------+-------------+-----------+----------+-------+_0" disediakan selama instalasi untuk pengujian Anda Mari kita mulai dengan contoh sederhana - database penjualan produk. Database penjualan produk biasanya terdiri dari banyak tabel, mis. g. , produk, pelanggan, pemasok, pesanan, pembayaran, karyawan, antara lain. Sebut saja database kita " mysql> SELECT * FROM products WHERE quantity >= 5000 AND name LIKE 'Pen %'; +-----------+-------------+----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+----------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | | 1002 | PEN | Pen Blue | 8000 | 1.25 | +-----------+-------------+----------+----------+-------+ mysql> SELECT * FROM products WHERE quantity >= 5000 AND price < 1.24 AND name LIKE 'Pen %'; +-----------+-------------+---------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+---------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | +-----------+-------------+---------+----------+-------+ mysql> SELECT * FROM products WHERE NOT (quantity >= 5000 AND name LIKE 'Pen %'); +-----------+-------------+-----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+-----------+----------+-------+ | 1003 | PEN | Pen Black | 2000 | 1.25 | | 1004 | PEC | Pencil 2B | 10000 | 0.48 | | 1005 | PEC | Pencil 2H | 8000 | 0.49 | +-----------+-------------+-----------+----------+-------+_1" (terinspirasi dari database sampel Microsoft Northwind Trader). Kita akan mulai dengan tabel pertama yang disebut " mysql> SELECT * FROM products WHERE quantity >= 5000 AND name LIKE 'Pen %'; +-----------+-------------+----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+----------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | | 1002 | PEN | Pen Blue | 8000 | 1.25 | +-----------+-------------+----------+----------+-------+ mysql> SELECT * FROM products WHERE quantity >= 5000 AND price < 1.24 AND name LIKE 'Pen %'; +-----------+-------------+---------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+---------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | +-----------+-------------+---------+----------+-------+ mysql> SELECT * FROM products WHERE NOT (quantity >= 5000 AND name LIKE 'Pen %'); +-----------+-------------+-----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+-----------+----------+-------+ | 1003 | PEN | Pen Black | 2000 | 1.25 | | 1004 | PEC | Pencil 2B | 10000 | 0.48 | | 1005 | PEC | Pencil 2H | 8000 | 0.49 | +-----------+-------------+-----------+----------+-------+_2" dengan kolom berikut (memiliki tipe data seperti yang ditunjukkan) dan barisBasis data. angin selatan Meja. ID produk produk INTproductCode Nama CHAR(3). VARCHAR(30) kuantitas INTharga DECIMAL(10,2)1001PENPena Merah50001. 231002PENPen Biru80001. 251003PEN Pena Hitam20001. 251004PECPensil 2B100000. 481005PECPensil 2H80000. 49 Membuat dan Menghapus Database - BUAT DATABASE dan DROP DATABASEAnda dapat membuat database baru menggunakan perintah SQL " mysql> SELECT * FROM products WHERE quantity >= 5000 AND name LIKE 'Pen %'; +-----------+-------------+----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+----------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | | 1002 | PEN | Pen Blue | 8000 | 1.25 | +-----------+-------------+----------+----------+-------+ mysql> SELECT * FROM products WHERE quantity >= 5000 AND price < 1.24 AND name LIKE 'Pen %'; +-----------+-------------+---------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+---------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | +-----------+-------------+---------+----------+-------+ mysql> SELECT * FROM products WHERE NOT (quantity >= 5000 AND name LIKE 'Pen %'); +-----------+-------------+-----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+-----------+----------+-------+ | 1003 | PEN | Pen Black | 2000 | 1.25 | | 1004 | PEC | Pencil 2B | 10000 | 0.48 | | 1005 | PEC | Pencil 2H | 8000 | 0.49 | +-----------+-------------+-----------+----------+-------+3"; . Secara opsional, Anda dapat menerapkan ketentuan " mysql> SELECT * FROM products WHERE quantity >= 5000 AND name LIKE 'Pen %'; +-----------+-------------+----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+----------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | | 1002 | PEN | Pen Blue | 8000 | 1.25 | +-----------+-------------+----------+----------+-------+ mysql> SELECT * FROM products WHERE quantity >= 5000 AND price < 1.24 AND name LIKE 'Pen %'; +-----------+-------------+---------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+---------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | +-----------+-------------+---------+----------+-------+ mysql> SELECT * FROM products WHERE NOT (quantity >= 5000 AND name LIKE 'Pen %'); +-----------+-------------+-----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+-----------+----------+-------+ | 1003 | PEN | Pen Black | 2000 | 1.25 | | 1004 | PEC | Pencil 2B | 10000 | 0.48 | | 1005 | PEC | Pencil 2H | 8000 | 0.49 | +-----------+-------------+-----------+----------+-------+_5" atau " mysql> SELECT * FROM products WHERE quantity >= 5000 AND name LIKE 'Pen %'; +-----------+-------------+----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+----------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | | 1002 | PEN | Pen Blue | 8000 | 1.25 | +-----------+-------------+----------+----------+-------+ mysql> SELECT * FROM products WHERE quantity >= 5000 AND price < 1.24 AND name LIKE 'Pen %'; +-----------+-------------+---------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+---------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | +-----------+-------------+---------+----------+-------+ mysql> SELECT * FROM products WHERE NOT (quantity >= 5000 AND name LIKE 'Pen %'); +-----------+-------------+-----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+-----------+----------+-------+ | 1003 | PEN | Pen Black | 2000 | 1.25 | | 1004 | PEC | Pencil 2B | 10000 | 0.48 | | 1005 | PEC | Pencil 2H | 8000 | 0.49 | +-----------+-------------+-----------+----------+-------+6" ke perintah ini. Sebagai contoh, mysql> CREATE DATABASE southwind; Query OK, 1 row affected (0.03 sec) mysql> DROP DATABASE southwind; Query OK, 0 rows affected (0.11 sec) mysql> CREATE DATABASE IF NOT EXISTS southwind; Query OK, 1 row affected (0.01 sec) mysql> DROP DATABASE IF EXISTS southwind; Query OK, 0 rows affected (0.00 sec) PENTING. Gunakan perintah SQL mysql> SELECT * FROM products WHERE quantity >= 5000 AND name LIKE 'Pen %'; +-----------+-------------+----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+----------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | | 1002 | PEN | Pen Blue | 8000 | 1.25 | +-----------+-------------+----------+----------+-------+ mysql> SELECT * FROM products WHERE quantity >= 5000 AND price < 1.24 AND name LIKE 'Pen %'; +-----------+-------------+---------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+---------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | +-----------+-------------+---------+----------+-------+ mysql> SELECT * FROM products WHERE NOT (quantity >= 5000 AND name LIKE 'Pen %'); +-----------+-------------+-----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+-----------+----------+-------+ | 1003 | PEN | Pen Black | 2000 | 1.25 | | 1004 | PEC | Pencil 2B | 10000 | 0.48 | | 1005 | PEC | Pencil 2H | 8000 | 0.49 | +-----------+-------------+-----------+----------+-------+7 (dan mysql> SELECT * FROM products WHERE quantity >= 5000 AND name LIKE 'Pen %'; +-----------+-------------+----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+----------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | | 1002 | PEN | Pen Blue | 8000 | 1.25 | +-----------+-------------+----------+----------+-------+ mysql> SELECT * FROM products WHERE quantity >= 5000 AND price < 1.24 AND name LIKE 'Pen %'; +-----------+-------------+---------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+---------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | +-----------+-------------+---------+----------+-------+ mysql> SELECT * FROM products WHERE NOT (quantity >= 5000 AND name LIKE 'Pen %'); +-----------+-------------+-----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+-----------+----------+-------+ | 1003 | PEN | Pen Black | 2000 | 1.25 | | 1004 | PEC | Pencil 2B | 10000 | 0.48 | | 1005 | PEC | Pencil 2H | 8000 | 0.49 | +-----------+-------------+-----------+----------+-------+8) dengan sangat hati-hati, karena entitas yang dihapus tidak dapat dipulihkan. TIDAK ADA ULANG TAMPILKAN BUAT DATABASEPerintah mysql> SELECT * FROM products WHERE quantity >= 5000 AND name LIKE 'Pen %'; +-----------+-------------+----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+----------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | | 1002 | PEN | Pen Blue | 8000 | 1.25 | +-----------+-------------+----------+----------+-------+ mysql> SELECT * FROM products WHERE quantity >= 5000 AND price < 1.24 AND name LIKE 'Pen %'; +-----------+-------------+---------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+---------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | +-----------+-------------+---------+----------+-------+ mysql> SELECT * FROM products WHERE NOT (quantity >= 5000 AND name LIKE 'Pen %'); +-----------+-------------+-----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+-----------+----------+-------+ | 1003 | PEN | Pen Black | 2000 | 1.25 | | 1004 | PEC | Pencil 2B | 10000 | 0.48 | | 1005 | PEC | Pencil 2H | 8000 | 0.49 | +-----------+-------------+-----------+----------+-------+9 menggunakan beberapa default. Anda dapat mengeluarkan " mysql> SELECT * FROM products WHERE name IN ('Pen Red', 'Pen Black');
+-----------+-------------+-----------+----------+-------+
| productID | productCode | name | quantity | price |
+-----------+-------------+-----------+----------+-------+
| 1001 | PEN | Pen Red | 5000 | 1.23 |
| 1003 | PEN | Pen Black | 2000 | 1.25 |
+-----------+-------------+-----------+----------+-------+0" untuk menampilkan perintah lengkap dan memeriksa nilai default ini. Kami menggunakan mysql> SELECT * FROM products WHERE name IN ('Pen Red', 'Pen Black');
+-----------+-------------+-----------+----------+-------+
| productID | productCode | name | quantity | price |
+-----------+-------------+-----------+----------+-------+
| 1001 | PEN | Pen Red | 5000 | 1.23 |
| 1003 | PEN | Pen Black | 2000 | 1.25 |
+-----------+-------------+-----------+----------+-------+_1 (bukan mysql> SELECT * FROM products WHERE name IN ('Pen Red', 'Pen Black');
+-----------+-------------+-----------+----------+-------+
| productID | productCode | name | quantity | price |
+-----------+-------------+-----------+----------+-------+
| 1001 | PEN | Pen Red | 5000 | 1.23 |
| 1003 | PEN | Pen Black | 2000 | 1.25 |
+-----------+-------------+-----------+----------+-------+2) untuk menampilkan hasil secara vertikal. (Coba bandingkan output yang dihasilkan oleh mysql> SELECT * FROM products WHERE name IN ('Pen Red', 'Pen Black');
+-----------+-------------+-----------+----------+-------+
| productID | productCode | name | quantity | price |
+-----------+-------------+-----------+----------+-------+
| 1001 | PEN | Pen Red | 5000 | 1.23 |
| 1003 | PEN | Pen Black | 2000 | 1.25 |
+-----------+-------------+-----------+----------+-------+2 dan mysql> SELECT * FROM products WHERE name IN ('Pen Red', 'Pen Black');
+-----------+-------------+-----------+----------+-------+
| productID | productCode | name | quantity | price |
+-----------+-------------+-----------+----------+-------+
| 1001 | PEN | Pen Red | 5000 | 1.23 |
| 1003 | PEN | Pen Black | 2000 | 1.25 |
+-----------+-------------+-----------+----------+-------+1. )mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */Pengidentifikasi yang Dikutip Balik (`nama`)Nama atau pengidentifikasi yang tidak dikutip (seperti nama basis data, nama tabel, dan nama kolom) tidak boleh berisi karakter kosong dan khusus, atau macet dengan kata kunci MySQL (seperti mysql> SELECT * FROM products WHERE name IN ('Pen Red', 'Pen Black');
+-----------+-------------+-----------+----------+-------+
| productID | productCode | name | quantity | price |
+-----------+-------------+-----------+----------+-------+
| 1001 | PEN | Pen Red | 5000 | 1.23 |
| 1003 | PEN | Pen Black | 2000 | 1.25 |
+-----------+-------------+-----------+----------+-------+5 dan mysql> SELECT * FROM products WHERE name IN ('Pen Red', 'Pen Black');
+-----------+-------------+-----------+----------+-------+
| productID | productCode | name | quantity | price |
+-----------+-------------+-----------+----------+-------+
| 1001 | PEN | Pen Red | 5000 | 1.23 |
| 1003 | PEN | Pen Black | 2000 | 1.25 |
+-----------+-------------+-----------+----------+-------+6). Anda dapat menyertakan karakter kosong dan khusus atau menggunakan kata kunci MySQL sebagai pengenal dengan melampirkannya dengan sepasang back-quote, dalam bentuk mysql> SELECT * FROM products WHERE name IN ('Pen Red', 'Pen Black');
+-----------+-------------+-----------+----------+-------+
| productID | productCode | name | quantity | price |
+-----------+-------------+-----------+----------+-------+
| 1001 | PEN | Pen Red | 5000 | 1.23 |
| 1003 | PEN | Pen Black | 2000 | 1.25 |
+-----------+-------------+-----------+----------+-------+7Untuk ketangguhan, perintah mysql> SELECT * FROM products WHERE name IN ('Pen Red', 'Pen Black');
+-----------+-------------+-----------+----------+-------+
| productID | productCode | name | quantity | price |
+-----------+-------------+-----------+----------+-------+
| 1001 | PEN | Pen Red | 5000 | 1.23 |
| 1003 | PEN | Pen Black | 2000 | 1.25 |
+-----------+-------------+-----------+----------+-------+_8 mengutip kembali semua pengidentifikasi, seperti yang diilustrasikan dalam contoh di atasKomentar dan Komentar VersiKomentar multi-baris MySQL dilampirkan dalam mysql> SELECT * FROM products WHERE name IN ('Pen Red', 'Pen Black');
+-----------+-------------+-----------+----------+-------+
| productID | productCode | name | quantity | price |
+-----------+-------------+-----------+----------+-------+
| 1001 | PEN | Pen Red | 5000 | 1.23 |
| 1003 | PEN | Pen Black | 2000 | 1.25 |
+-----------+-------------+-----------+----------+-------+9 dan mysql> SELECT * FROM products
WHERE (price BETWEEN 1.0 AND 2.0) AND (quantity BETWEEN 1000 AND 2000);
+-----------+-------------+-----------+----------+-------+
| productID | productCode | name | quantity | price |
+-----------+-------------+-----------+----------+-------+
| 1003 | PEN | Pen Black | 2000 | 1.25 |
+-----------+-------------+-----------+----------+-------+0; mysql> SELECT * FROM products
WHERE (price BETWEEN 1.0 AND 2.0) AND (quantity BETWEEN 1000 AND 2000);
+-----------+-------------+-----------+----------+-------+
| productID | productCode | name | quantity | price |
+-----------+-------------+-----------+----------+-------+
| 1003 | PEN | Pen Black | 2000 | 1.25 |
+-----------+-------------+-----------+----------+-------+_3 dikenal sebagai komentar versi, yang hanya akan dijalankan jika server berada pada atau di atas nomor versi ini mysql> SELECT * FROM products
WHERE (price BETWEEN 1.0 AND 2.0) AND (quantity BETWEEN 1000 AND 2000);
+-----------+-------------+-----------+----------+-------+
| productID | productCode | name | quantity | price |
+-----------+-------------+-----------+----------+-------+
| 1003 | PEN | Pen Black | 2000 | 1.25 |
+-----------+-------------+-----------+----------+-------+4. Untuk memeriksa versi server MySQL Anda, berikan kueri "mysql> SELECT * FROM products
WHERE (price BETWEEN 1.0 AND 2.0) AND (quantity BETWEEN 1000 AND 2000);
+-----------+-------------+-----------+----------+-------+
| productID | productCode | name | quantity | price |
+-----------+-------------+-----------+----------+-------+
| 1003 | PEN | Pen Black | 2000 | 1.25 |
+-----------+-------------+-----------+----------+-------+5"Mengatur Basis Data Default - GUNAKANPerintah " mysql> SELECT * FROM products
WHERE (price BETWEEN 1.0 AND 2.0) AND (quantity BETWEEN 1000 AND 2000);
+-----------+-------------+-----------+----------+-------+
| productID | productCode | name | quantity | price |
+-----------+-------------+-----------+----------+-------+
| 1003 | PEN | Pen Black | 2000 | 1.25 |
+-----------+-------------+-----------+----------+-------+_6" menetapkan database tertentu sebagai database default (atau saat ini). Anda dapat mereferensikan tabel di database default menggunakan mysql> SELECT * FROM products
WHERE (price BETWEEN 1.0 AND 2.0) AND (quantity BETWEEN 1000 AND 2000);
+-----------+-------------+-----------+----------+-------+
| productID | productCode | name | quantity | price |
+-----------+-------------+-----------+----------+-------+
| 1003 | PEN | Pen Black | 2000 | 1.25 |
+-----------+-------------+-----------+----------+-------+7 secara langsung. Tetapi Anda perlu menggunakan mysql> SELECT * FROM products
WHERE (price BETWEEN 1.0 AND 2.0) AND (quantity BETWEEN 1000 AND 2000);
+-----------+-------------+-----------+----------+-------+
| productID | productCode | name | quantity | price |
+-----------+-------------+-----------+----------+-------+
| 1003 | PEN | Pen Black | 2000 | 1.25 |
+-----------+-------------+-----------+----------+-------+8 yang sepenuhnya memenuhi syarat untuk mereferensikan tabel BUKAN di database defaultDalam contoh kita, kita memiliki database bernama " mysql> SELECT * FROM products WHERE quantity >= 5000 AND name LIKE 'Pen %'; +-----------+-------------+----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+----------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | | 1002 | PEN | Pen Blue | 8000 | 1.25 | +-----------+-------------+----------+----------+-------+ mysql> SELECT * FROM products WHERE quantity >= 5000 AND price < 1.24 AND name LIKE 'Pen %'; +-----------+-------------+---------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+---------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | +-----------+-------------+---------+----------+-------+ mysql> SELECT * FROM products WHERE NOT (quantity >= 5000 AND name LIKE 'Pen %'); +-----------+-------------+-----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+-----------+----------+-------+ | 1003 | PEN | Pen Black | 2000 | 1.25 | | 1004 | PEC | Pencil 2B | 10000 | 0.48 | | 1005 | PEC | Pencil 2H | 8000 | 0.49 | +-----------+-------------+-----------+----------+-------+1" dengan tabel bernama " mysql> SELECT * FROM products WHERE quantity >= 5000 AND name LIKE 'Pen %'; +-----------+-------------+----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+----------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | | 1002 | PEN | Pen Blue | 8000 | 1.25 | +-----------+-------------+----------+----------+-------+ mysql> SELECT * FROM products WHERE quantity >= 5000 AND price < 1.24 AND name LIKE 'Pen %'; +-----------+-------------+---------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+---------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | +-----------+-------------+---------+----------+-------+ mysql> SELECT * FROM products WHERE NOT (quantity >= 5000 AND name LIKE 'Pen %'); +-----------+-------------+-----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+-----------+----------+-------+ | 1003 | PEN | Pen Black | 2000 | 1.25 | | 1004 | PEC | Pencil 2B | 10000 | 0.48 | | 1005 | PEC | Pencil 2H | 8000 | 0.49 | +-----------+-------------+-----------+----------+-------+2". Jika kita mengeluarkan " mysql> SELECT * FROM products WHERE productCode IS NULL; Empty set (0.00 sec)1" untuk menetapkan mysql> SELECT * FROM products WHERE quantity >= 5000 AND name LIKE 'Pen %'; +-----------+-------------+----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+----------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | | 1002 | PEN | Pen Blue | 8000 | 1.25 | +-----------+-------------+----------+----------+-------+ mysql> SELECT * FROM products WHERE quantity >= 5000 AND price < 1.24 AND name LIKE 'Pen %'; +-----------+-------------+---------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+---------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | +-----------+-------------+---------+----------+-------+ mysql> SELECT * FROM products WHERE NOT (quantity >= 5000 AND name LIKE 'Pen %'); +-----------+-------------+-----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+-----------+----------+-------+ | 1003 | PEN | Pen Black | 2000 | 1.25 | | 1004 | PEC | Pencil 2B | 10000 | 0.48 | | 1005 | PEC | Pencil 2H | 8000 | 0.49 | +-----------+-------------+-----------+----------+-------+1 sebagai database default, kita cukup memanggil tabel sebagai " mysql> SELECT * FROM products WHERE quantity >= 5000 AND name LIKE 'Pen %'; +-----------+-------------+----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+----------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | | 1002 | PEN | Pen Blue | 8000 | 1.25 | +-----------+-------------+----------+----------+-------+ mysql> SELECT * FROM products WHERE quantity >= 5000 AND price < 1.24 AND name LIKE 'Pen %'; +-----------+-------------+---------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+---------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | +-----------+-------------+---------+----------+-------+ mysql> SELECT * FROM products WHERE NOT (quantity >= 5000 AND name LIKE 'Pen %'); +-----------+-------------+-----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+-----------+----------+-------+ | 1003 | PEN | Pen Black | 2000 | 1.25 | | 1004 | PEC | Pencil 2B | 10000 | 0.48 | | 1005 | PEC | Pencil 2H | 8000 | 0.49 | +-----------+-------------+-----------+----------+-------+2". Jika tidak, kita perlu mereferensikan tabel sebagai " mysql> SELECT * FROM products WHERE productCode IS NULL; Empty set (0.00 sec)4" Untuk menampilkan database default saat ini, keluarkan perintah " mysql> SELECT * FROM products WHERE productCode IS NULL; Empty set (0.00 sec)5" Membuat dan Menghapus Tabel - CREATE TABLE dan DROP TABLEAnda dapat membuat tabel baru di database default menggunakan perintah " mysql> SELECT * FROM products WHERE productCode IS NULL; Empty set (0.00 sec)6" dan " mysql> SELECT * FROM products WHERE productCode IS NULL; Empty set (0.00 sec)7". Anda juga dapat menerapkan ketentuan " mysql> SELECT * FROM products WHERE quantity >= 5000 AND name LIKE 'Pen %'; +-----------+-------------+----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+----------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | | 1002 | PEN | Pen Blue | 8000 | 1.25 | +-----------+-------------+----------+----------+-------+ mysql> SELECT * FROM products WHERE quantity >= 5000 AND price < 1.24 AND name LIKE 'Pen %'; +-----------+-------------+---------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+---------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | +-----------+-------------+---------+----------+-------+ mysql> SELECT * FROM products WHERE NOT (quantity >= 5000 AND name LIKE 'Pen %'); +-----------+-------------+-----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+-----------+----------+-------+ | 1003 | PEN | Pen Black | 2000 | 1.25 | | 1004 | PEC | Pencil 2B | 10000 | 0.48 | | 1005 | PEC | Pencil 2H | 8000 | 0.49 | +-----------+-------------+-----------+----------+-------+_5" atau " mysql> SELECT * FROM products WHERE quantity >= 5000 AND name LIKE 'Pen %'; +-----------+-------------+----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+----------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | | 1002 | PEN | Pen Blue | 8000 | 1.25 | +-----------+-------------+----------+----------+-------+ mysql> SELECT * FROM products WHERE quantity >= 5000 AND price < 1.24 AND name LIKE 'Pen %'; +-----------+-------------+---------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+---------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | +-----------+-------------+---------+----------+-------+ mysql> SELECT * FROM products WHERE NOT (quantity >= 5000 AND name LIKE 'Pen %'); +-----------+-------------+-----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+-----------+----------+-------+ | 1003 | PEN | Pen Black | 2000 | 1.25 | | 1004 | PEC | Pencil 2B | 10000 | 0.48 | | 1005 | PEC | Pencil 2H | 8000 | 0.49 | +-----------+-------------+-----------+----------+-------+6". Untuk membuat tabel, Anda perlu mendefinisikan semua kolomnya, dengan memberikan nama, tipe, dan atribut kolom Mari buat tabel " mysql> SELECT * FROM products WHERE quantity >= 5000 AND name LIKE 'Pen %'; +-----------+-------------+----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+----------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | | 1002 | PEN | Pen Blue | 8000 | 1.25 | +-----------+-------------+----------+----------+-------+ mysql> SELECT * FROM products WHERE quantity >= 5000 AND price < 1.24 AND name LIKE 'Pen %'; +-----------+-------------+---------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+---------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | +-----------+-------------+---------+----------+-------+ mysql> SELECT * FROM products WHERE NOT (quantity >= 5000 AND name LIKE 'Pen %'); +-----------+-------------+-----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+-----------+----------+-------+ | 1003 | PEN | Pen Black | 2000 | 1.25 | | 1004 | PEC | Pencil 2B | 10000 | 0.48 | | 1005 | PEC | Pencil 2H | 8000 | 0.49 | +-----------+-------------+-----------+----------+-------+_2" di database kita " mysql> SELECT * FROM products WHERE quantity >= 5000 AND name LIKE 'Pen %'; +-----------+-------------+----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+----------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | | 1002 | PEN | Pen Blue | 8000 | 1.25 | +-----------+-------------+----------+----------+-------+ mysql> SELECT * FROM products WHERE quantity >= 5000 AND price < 1.24 AND name LIKE 'Pen %'; +-----------+-------------+---------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+---------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | +-----------+-------------+---------+----------+-------+ mysql> SELECT * FROM products WHERE NOT (quantity >= 5000 AND name LIKE 'Pen %'); +-----------+-------------+-----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+-----------+----------+-------+ | 1003 | PEN | Pen Black | 2000 | 1.25 | | 1004 | PEC | Pencil 2B | 10000 | 0.48 | | 1005 | PEC | Pencil 2H | 8000 | 0.49 | +-----------+-------------+-----------+----------+-------+1" PenjelasanKami mendefinisikan 5 kolom dalam tabel mysql> SELECT * FROM products WHERE quantity >= 5000 AND name LIKE 'Pen %'; +-----------+-------------+----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+----------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | | 1002 | PEN | Pen Blue | 8000 | 1.25 | +-----------+-------------+----------+----------+-------+ mysql> SELECT * FROM products WHERE quantity >= 5000 AND price < 1.24 AND name LIKE 'Pen %'; +-----------+-------------+---------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+---------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | +-----------+-------------+---------+----------+-------+ mysql> SELECT * FROM products WHERE NOT (quantity >= 5000 AND name LIKE 'Pen %'); +-----------+-------------+-----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+-----------+----------+-------+ | 1003 | PEN | Pen Black | 2000 | 1.25 | | 1004 | PEC | Pencil 2B | 10000 | 0.48 | | 1005 | PEC | Pencil 2H | 8000 | 0.49 | +-----------+-------------+-----------+----------+-------+2. SELECT .. FROM tableName WHERE criteria ORDER BY columnA ASC|DESC, columnB ASC|DESC, ...3, SELECT .. FROM tableName WHERE criteria ORDER BY columnA ASC|DESC, columnB ASC|DESC, ...4, SELECT .. FROM tableName WHERE criteria ORDER BY columnA ASC|DESC, columnB ASC|DESC, ...5, SELECT .. FROM tableName WHERE criteria ORDER BY columnA ASC|DESC, columnB ASC|DESC, ...6 dan SELECT .. FROM tableName WHERE criteria ORDER BY columnA ASC|DESC, columnB ASC|DESC, ...7. Jenis-jenisnya adalah
Atribut " mysql> CREATE DATABASE southwind; Query OK, 1 row affected (0.03 sec) mysql> DROP DATABASE southwind; Query OK, 0 rows affected (0.11 sec) mysql> CREATE DATABASE IF NOT EXISTS southwind; Query OK, 1 row affected (0.01 sec) mysql> DROP DATABASE IF EXISTS southwind; Query OK, 0 rows affected (0.00 sec)_17" menentukan bahwa kolom tidak boleh berisi nilai mysql> CREATE DATABASE southwind; Query OK, 1 row affected (0.03 sec) mysql> DROP DATABASE southwind; Query OK, 0 rows affected (0.11 sec) mysql> CREATE DATABASE IF NOT EXISTS southwind; Query OK, 1 row affected (0.01 sec) mysql> DROP DATABASE IF EXISTS southwind; Query OK, 0 rows affected (0.00 sec)18. mysql> CREATE DATABASE southwind; Query OK, 1 row affected (0.03 sec) mysql> DROP DATABASE southwind; Query OK, 0 rows affected (0.11 sec) mysql> CREATE DATABASE IF NOT EXISTS southwind; Query OK, 1 row affected (0.01 sec) mysql> DROP DATABASE IF EXISTS southwind; Query OK, 0 rows affected (0.00 sec)18 adalah nilai khusus yang menunjukkan "tidak ada nilai", "nilai tidak diketahui" atau "nilai hilang". Dalam kasus kami, kolom ini harus memiliki nilai yang tepat. Kami juga menetapkan nilai default kolom. Kolom akan menggunakan nilai defaultnya, jika tidak ada nilai yang ditentukan selama pembuatan rekaman Kami mengatur kolom SELECT .. FROM tableName WHERE criteria ORDER BY columnA ASC|DESC, columnB ASC|DESC, ..._3 sebagai apa yang disebut kunci utama. Nilai kolom kunci utama harus unik. Setiap tabel harus berisi kunci utama. Ini memastikan bahwa setiap baris dapat dibedakan dari baris lainnya. Anda dapat menentukan satu kolom atau sekumpulan kolom (mis. g. , mysql> CREATE DATABASE southwind; Query OK, 1 row affected (0.03 sec) mysql> DROP DATABASE southwind; Query OK, 0 rows affected (0.11 sec) mysql> CREATE DATABASE IF NOT EXISTS southwind; Query OK, 1 row affected (0.01 sec) mysql> DROP DATABASE IF EXISTS southwind; Query OK, 0 rows affected (0.00 sec)21 dan mysql> CREATE DATABASE southwind; Query OK, 1 row affected (0.03 sec) mysql> DROP DATABASE southwind; Query OK, 0 rows affected (0.11 sec) mysql> CREATE DATABASE IF NOT EXISTS southwind; Query OK, 1 row affected (0.01 sec) mysql> DROP DATABASE IF EXISTS southwind; Query OK, 0 rows affected (0.00 sec)22) sebagai primary key. Indeks dibangun secara otomatis pada kolom kunci utama untuk memfasilitasi pencarian cepat. Kunci primer juga digunakan sebagai referensi oleh tabel lain Kami mengatur kolom SELECT .. FROM tableName WHERE criteria ORDER BY columnA ASC|DESC, columnB ASC|DESC, ...3 ke mysql> CREATE DATABASE southwind; Query OK, 1 row affected (0.03 sec) mysql> DROP DATABASE southwind; Query OK, 0 rows affected (0.11 sec) mysql> CREATE DATABASE IF NOT EXISTS southwind; Query OK, 1 row affected (0.01 sec) mysql> DROP DATABASE IF EXISTS southwind; Query OK, 0 rows affected (0.00 sec)24. dengan nilai awal default 1. Saat Anda menyisipkan baris dengan mysql> CREATE DATABASE southwind; Query OK, 1 row affected (0.03 sec) mysql> DROP DATABASE southwind; Query OK, 0 rows affected (0.11 sec) mysql> CREATE DATABASE IF NOT EXISTS southwind; Query OK, 1 row affected (0.01 sec) mysql> DROP DATABASE IF EXISTS southwind; Query OK, 0 rows affected (0.00 sec)_18 (disarankan) (atau 0, atau nilai yang hilang) untuk kolom mysql> CREATE DATABASE southwind; Query OK, 1 row affected (0.03 sec) mysql> DROP DATABASE southwind; Query OK, 0 rows affected (0.11 sec) mysql> CREATE DATABASE IF NOT EXISTS southwind; Query OK, 1 row affected (0.01 sec) mysql> DROP DATABASE IF EXISTS southwind; Query OK, 0 rows affected (0.00 sec)24, nilai maksimum kolom tersebut ditambah 1 akan dimasukkan. Anda juga dapat memasukkan nilai yang valid ke kolom mysql> CREATE DATABASE southwind; Query OK, 1 row affected (0.03 sec) mysql> DROP DATABASE southwind; Query OK, 0 rows affected (0.11 sec) mysql> CREATE DATABASE IF NOT EXISTS southwind; Query OK, 1 row affected (0.01 sec) mysql> DROP DATABASE IF EXISTS southwind; Query OK, 0 rows affected (0.00 sec)24, melewati penambahan otomatis Memasukkan Baris - INSERT INTOMari isi tabel " mysql> SELECT * FROM products WHERE quantity >= 5000 AND name LIKE 'Pen %'; +-----------+-------------+----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+----------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | | 1002 | PEN | Pen Blue | 8000 | 1.25 | +-----------+-------------+----------+----------+-------+ mysql> SELECT * FROM products WHERE quantity >= 5000 AND price < 1.24 AND name LIKE 'Pen %'; +-----------+-------------+---------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+---------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | +-----------+-------------+---------+----------+-------+ mysql> SELECT * FROM products WHERE NOT (quantity >= 5000 AND name LIKE 'Pen %'); +-----------+-------------+-----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+-----------+----------+-------+ | 1003 | PEN | Pen Black | 2000 | 1.25 | | 1004 | PEC | Pencil 2B | 10000 | 0.48 | | 1005 | PEC | Pencil 2H | 8000 | 0.49 | +-----------+-------------+-----------+----------+-------+_2" kita dengan baris. Kami menyetel SELECT .. FROM tableName WHERE criteria ORDER BY columnA ASC|DESC, columnB ASC|DESC, ...3 dari record pertama ke 1001, dan menggunakan mysql> CREATE DATABASE southwind; Query OK, 1 row affected (0.03 sec) mysql> DROP DATABASE southwind; Query OK, 0 rows affected (0.11 sec) mysql> CREATE DATABASE IF NOT EXISTS southwind; Query OK, 1 row affected (0.01 sec) mysql> DROP DATABASE IF EXISTS southwind; Query OK, 0 rows affected (0.00 sec)24 untuk record lainnya dengan memasukkan mysql> CREATE DATABASE southwind; Query OK, 1 row affected (0.03 sec) mysql> DROP DATABASE southwind; Query OK, 0 rows affected (0.11 sec) mysql> CREATE DATABASE IF NOT EXISTS southwind; Query OK, 1 row affected (0.01 sec) mysql> DROP DATABASE IF EXISTS southwind; Query OK, 0 rows affected (0.00 sec)18, atau dengan nilai kolom yang hilang. Perhatikan bahwa string harus diapit dengan sepasang tanda kutip tunggal (atau tanda kutip ganda) MASUKKAN KE SintaksKita dapat menggunakan pernyataan mysql> CREATE DATABASE southwind; Query OK, 1 row affected (0.03 sec) mysql> DROP DATABASE southwind; Query OK, 0 rows affected (0.11 sec) mysql> CREATE DATABASE IF NOT EXISTS southwind; Query OK, 1 row affected (0.01 sec) mysql> DROP DATABASE IF EXISTS southwind; Query OK, 0 rows affected (0.00 sec)_32 untuk menyisipkan baris baru dengan semua nilai kolom, menggunakan sintaks berikut Anda perlu mencantumkan nilai dalam urutan yang sama di mana kolom didefinisikan dalam mysql> CREATE DATABASE southwind; Query OK, 1 row affected (0.03 sec) mysql> DROP DATABASE southwind; Query OK, 0 rows affected (0.11 sec) mysql> CREATE DATABASE IF NOT EXISTS southwind; Query OK, 1 row affected (0.01 sec) mysql> DROP DATABASE IF EXISTS southwind; Query OK, 0 rows affected (0.00 sec)33, dipisahkan dengan koma. Untuk kolom tipe data string ( mysql> CREATE DATABASE southwind; Query OK, 1 row affected (0.03 sec) mysql> DROP DATABASE southwind; Query OK, 0 rows affected (0.11 sec) mysql> CREATE DATABASE IF NOT EXISTS southwind; Query OK, 1 row affected (0.01 sec) mysql> DROP DATABASE IF EXISTS southwind; Query OK, 0 rows affected (0.00 sec)_08, mysql> CREATE DATABASE southwind; Query OK, 1 row affected (0.03 sec) mysql> DROP DATABASE southwind; Query OK, 0 rows affected (0.11 sec) mysql> CREATE DATABASE IF NOT EXISTS southwind; Query OK, 1 row affected (0.01 sec) mysql> DROP DATABASE IF EXISTS southwind; Query OK, 0 rows affected (0.00 sec)07), sertakan nilai dengan sepasang tanda kutip tunggal (atau tanda kutip ganda). Untuk kolom tipe data numerik ( mysql> CREATE DATABASE southwind; Query OK, 1 row affected (0.03 sec) mysql> DROP DATABASE southwind; Query OK, 0 rows affected (0.11 sec) mysql> CREATE DATABASE IF NOT EXISTS southwind; Query OK, 1 row affected (0.01 sec) mysql> DROP DATABASE IF EXISTS southwind; Query OK, 0 rows affected (0.00 sec)_36, mysql> CREATE DATABASE southwind; Query OK, 1 row affected (0.03 sec) mysql> DROP DATABASE southwind; Query OK, 0 rows affected (0.11 sec) mysql> CREATE DATABASE IF NOT EXISTS southwind; Query OK, 1 row affected (0.01 sec) mysql> DROP DATABASE IF EXISTS southwind; Query OK, 0 rows affected (0.00 sec)13, mysql> CREATE DATABASE southwind; Query OK, 1 row affected (0.03 sec) mysql> DROP DATABASE southwind; Query OK, 0 rows affected (0.11 sec) mysql> CREATE DATABASE IF NOT EXISTS southwind; Query OK, 1 row affected (0.01 sec) mysql> DROP DATABASE IF EXISTS southwind; Query OK, 0 rows affected (0.00 sec)14, mysql> CREATE DATABASE southwind; Query OK, 1 row affected (0.03 sec) mysql> DROP DATABASE southwind; Query OK, 0 rows affected (0.11 sec) mysql> CREATE DATABASE IF NOT EXISTS southwind; Query OK, 1 row affected (0.01 sec) mysql> DROP DATABASE IF EXISTS southwind; Query OK, 0 rows affected (0.00 sec)15), cukup tempatkan nomornya Anda juga dapat menyisipkan beberapa baris dalam satu pernyataan ________13______32 INSERT INTO tableName VALUES (row1FirstColumnValue, ..., row1lastColumnValue), (row2FirstColumnValue, ..., row2lastColumnValue), ... Untuk menyisipkan baris dengan nilai hanya pada kolom yang dipilih, gunakan Kolom yang tersisa akan menerima nilai defaultnya, seperti mysql> CREATE DATABASE southwind; Query OK, 1 row affected (0.03 sec) mysql> DROP DATABASE southwind; Query OK, 0 rows affected (0.11 sec) mysql> CREATE DATABASE IF NOT EXISTS southwind; Query OK, 1 row affected (0.01 sec) mysql> DROP DATABASE IF EXISTS southwind; Query OK, 0 rows affected (0.00 sec)24, default, atau mysql> CREATE DATABASE southwind; Query OK, 1 row affected (0.03 sec) mysql> DROP DATABASE southwind; Query OK, 0 rows affected (0.11 sec) mysql> CREATE DATABASE IF NOT EXISTS southwind; Query OK, 1 row affected (0.01 sec) mysql> DROP DATABASE IF EXISTS southwind; Query OK, 0 rows affected (0.00 sec)18 Meminta Database - PILIHTugas yang paling umum, penting, dan kompleks adalah membuat kueri database untuk subset data yang memenuhi kebutuhan Anda - dengan perintah mysql> CREATE DATABASE southwind; Query OK, 1 row affected (0.03 sec) mysql> DROP DATABASE southwind; Query OK, 0 rows affected (0.11 sec) mysql> CREATE DATABASE IF NOT EXISTS southwind; Query OK, 1 row affected (0.01 sec) mysql> DROP DATABASE IF EXISTS southwind; Query OK, 0 rows affected (0.00 sec)43. Perintah mysql> CREATE DATABASE southwind; Query OK, 1 row affected (0.03 sec) mysql> DROP DATABASE southwind; Query OK, 0 rows affected (0.11 sec) mysql> CREATE DATABASE IF NOT EXISTS southwind; Query OK, 1 row affected (0.01 sec) mysql> DROP DATABASE IF EXISTS southwind; Query OK, 0 rows affected (0.00 sec)_43 memiliki sintaks berikut Sebagai contoh, PILIH tanpa TabelAnda juga dapat menerbitkan mysql> CREATE DATABASE southwind; Query OK, 1 row affected (0.03 sec) mysql> DROP DATABASE southwind; Query OK, 0 rows affected (0.11 sec) mysql> CREATE DATABASE IF NOT EXISTS southwind; Query OK, 1 row affected (0.01 sec) mysql> DROP DATABASE IF EXISTS southwind; Query OK, 0 rows affected (0.00 sec)_43 tanpa tabel. Misalnya, Anda dapat mysql> CREATE DATABASE southwind; Query OK, 1 row affected (0.03 sec) mysql> DROP DATABASE southwind; Query OK, 0 rows affected (0.11 sec) mysql> CREATE DATABASE IF NOT EXISTS southwind; Query OK, 1 row affected (0.01 sec) mysql> DROP DATABASE IF EXISTS southwind; Query OK, 0 rows affected (0.00 sec)_43 ekspresi atau mengevaluasi fungsi bawaan Operator PerbandinganUntuk angka ( mysql> CREATE DATABASE southwind; Query OK, 1 row affected (0.03 sec) mysql> DROP DATABASE southwind; Query OK, 0 rows affected (0.11 sec) mysql> CREATE DATABASE IF NOT EXISTS southwind; Query OK, 1 row affected (0.01 sec) mysql> DROP DATABASE IF EXISTS southwind; Query OK, 0 rows affected (0.00 sec)_36, mysql> CREATE DATABASE southwind; Query OK, 1 row affected (0.03 sec) mysql> DROP DATABASE southwind; Query OK, 0 rows affected (0.11 sec) mysql> CREATE DATABASE IF NOT EXISTS southwind; Query OK, 1 row affected (0.01 sec) mysql> DROP DATABASE IF EXISTS southwind; Query OK, 0 rows affected (0.00 sec)13, mysql> CREATE DATABASE southwind; Query OK, 1 row affected (0.03 sec) mysql> DROP DATABASE southwind; Query OK, 0 rows affected (0.11 sec) mysql> CREATE DATABASE IF NOT EXISTS southwind; Query OK, 1 row affected (0.01 sec) mysql> DROP DATABASE IF EXISTS southwind; Query OK, 0 rows affected (0.00 sec)14), Anda dapat menggunakan operator pembanding. mysql> CREATE DATABASE southwind; Query OK, 1 row affected (0.03 sec) mysql> DROP DATABASE southwind; Query OK, 0 rows affected (0.11 sec) mysql> CREATE DATABASE IF NOT EXISTS southwind; Query OK, 1 row affected (0.01 sec) mysql> DROP DATABASE IF EXISTS southwind; Query OK, 0 rows affected (0.00 sec)50 (sama dengan), mysql> CREATE DATABASE southwind; Query OK, 1 row affected (0.03 sec) mysql> DROP DATABASE southwind; Query OK, 0 rows affected (0.11 sec) mysql> CREATE DATABASE IF NOT EXISTS southwind; Query OK, 1 row affected (0.01 sec) mysql> DROP DATABASE IF EXISTS southwind; Query OK, 0 rows affected (0.00 sec)51 atau mysql> CREATE DATABASE southwind; Query OK, 1 row affected (0.03 sec) mysql> DROP DATABASE southwind; Query OK, 0 rows affected (0.11 sec) mysql> CREATE DATABASE IF NOT EXISTS southwind; Query OK, 1 row affected (0.01 sec) mysql> DROP DATABASE IF EXISTS southwind; Query OK, 0 rows affected (0.00 sec)52 (tidak sama dengan), mysql> CREATE DATABASE southwind; Query OK, 1 row affected (0.03 sec) mysql> DROP DATABASE southwind; Query OK, 0 rows affected (0.11 sec) mysql> CREATE DATABASE IF NOT EXISTS southwind; Query OK, 1 row affected (0.01 sec) mysql> DROP DATABASE IF EXISTS southwind; Query OK, 0 rows affected (0.00 sec)53 (lebih besar dari), mysql> CREATE DATABASE southwind; Query OK, 1 row affected (0.03 sec) mysql> DROP DATABASE southwind; Query OK, 0 rows affected (0.11 sec) mysql> CREATE DATABASE IF NOT EXISTS southwind; Query OK, 1 row affected (0.01 sec) mysql> DROP DATABASE IF EXISTS southwind; Query OK, 0 rows affected (0.00 sec)54 (kurang dari), mysql> CREATE DATABASE southwind; Query OK, 1 row affected (0.03 sec) mysql> DROP DATABASE southwind; Query OK, 0 rows affected (0.11 sec) mysql> CREATE DATABASE IF NOT EXISTS southwind; Query OK, 1 row affected (0.01 sec) mysql> DROP DATABASE IF EXISTS southwind; Query OK, 0 rows affected (0.00 sec)55 (lebih besar dari atau sama dengan), mysql> CREATE DATABASE southwind; Query OK, 1 row affected (0.03 sec) mysql> DROP DATABASE southwind; Query OK, 0 rows affected (0.11 sec) mysql> CREATE DATABASE IF NOT EXISTS southwind; Query OK, 1 row affected (0.01 sec) mysql> DROP DATABASE IF EXISTS southwind; Query OK, 0 rows affected (0.00 sec)56 (kurang dari dua angka atau sama dengan), untuk membandingkan. Misalnya, mysql> CREATE DATABASE southwind; Query OK, 1 row affected (0.03 sec) mysql> DROP DATABASE southwind; Query OK, 0 rows affected (0.11 sec) mysql> CREATE DATABASE IF NOT EXISTS southwind; Query OK, 1 row affected (0.01 sec) mysql> DROP DATABASE IF EXISTS southwind; Query OK, 0 rows affected (0.00 sec)_57, mysql> CREATE DATABASE southwind; Query OK, 1 row affected (0.03 sec) mysql> DROP DATABASE southwind; Query OK, 0 rows affected (0.11 sec) mysql> CREATE DATABASE IF NOT EXISTS southwind; Query OK, 1 row affected (0.01 sec) mysql> DROP DATABASE IF EXISTS southwind; Query OK, 0 rows affected (0.00 sec)58 mysql> SELECT name, price FROM products WHERE price < 1.0; +-----------+-------+ | name | price | +-----------+-------+ | Pencil 2B | 0.48 | | Pencil 2H | 0.49 | +-----------+-------+ 2 rows in set (0.00 sec) mysql> SELECT name, quantity FROM products WHERE quantity <= 2000; +-----------+----------+ | name | quantity | +-----------+----------+ | Pen Black | 2000 | +-----------+----------+ 1 row in set (0.00 sec)_ PERINGATAN. Jangan membandingkan mysql> CREATE DATABASE southwind; Query OK, 1 row affected (0.03 sec) mysql> DROP DATABASE southwind; Query OK, 0 rows affected (0.11 sec) mysql> CREATE DATABASE IF NOT EXISTS southwind; Query OK, 1 row affected (0.01 sec) mysql> DROP DATABASE IF EXISTS southwind; Query OK, 0 rows affected (0.00 sec)14s (bilangan real) untuk kesetaraan ( mysql> CREATE DATABASE southwind; Query OK, 1 row affected (0.03 sec) mysql> DROP DATABASE southwind; Query OK, 0 rows affected (0.11 sec) mysql> CREATE DATABASE IF NOT EXISTS southwind; Query OK, 1 row affected (0.01 sec) mysql> DROP DATABASE IF EXISTS southwind; Query OK, 0 rows affected (0.00 sec)50 atau mysql> CREATE DATABASE southwind; Query OK, 1 row affected (0.03 sec) mysql> DROP DATABASE southwind; Query OK, 0 rows affected (0.11 sec) mysql> CREATE DATABASE IF NOT EXISTS southwind; Query OK, 1 row affected (0.01 sec) mysql> DROP DATABASE IF EXISTS southwind; Query OK, 0 rows affected (0.00 sec)51), karena tidak tepat. Di sisi lain, mysql> CREATE DATABASE southwind; Query OK, 1 row affected (0.03 sec) mysql> DROP DATABASE southwind; Query OK, 0 rows affected (0.11 sec) mysql> CREATE DATABASE IF NOT EXISTS southwind; Query OK, 1 row affected (0.01 sec) mysql> DROP DATABASE IF EXISTS southwind; Query OK, 0 rows affected (0.00 sec)13 tepat Untuk string, Anda juga bisa menggunakan mysql> CREATE DATABASE southwind; Query OK, 1 row affected (0.03 sec) mysql> DROP DATABASE southwind; Query OK, 0 rows affected (0.11 sec) mysql> CREATE DATABASE IF NOT EXISTS southwind; Query OK, 1 row affected (0.01 sec) mysql> DROP DATABASE IF EXISTS southwind; Query OK, 0 rows affected (0.00 sec)50, mysql> CREATE DATABASE southwind; Query OK, 1 row affected (0.03 sec) mysql> DROP DATABASE southwind; Query OK, 0 rows affected (0.11 sec) mysql> CREATE DATABASE IF NOT EXISTS southwind; Query OK, 1 row affected (0.01 sec) mysql> DROP DATABASE IF EXISTS southwind; Query OK, 0 rows affected (0.00 sec)51, mysql> CREATE DATABASE southwind; Query OK, 1 row affected (0.03 sec) mysql> DROP DATABASE southwind; Query OK, 0 rows affected (0.11 sec) mysql> CREATE DATABASE IF NOT EXISTS southwind; Query OK, 1 row affected (0.01 sec) mysql> DROP DATABASE IF EXISTS southwind; Query OK, 0 rows affected (0.00 sec)53, mysql> CREATE DATABASE southwind; Query OK, 1 row affected (0.03 sec) mysql> DROP DATABASE southwind; Query OK, 0 rows affected (0.11 sec) mysql> CREATE DATABASE IF NOT EXISTS southwind; Query OK, 1 row affected (0.01 sec) mysql> DROP DATABASE IF EXISTS southwind; Query OK, 0 rows affected (0.00 sec)54, mysql> CREATE DATABASE southwind; Query OK, 1 row affected (0.03 sec) mysql> DROP DATABASE southwind; Query OK, 0 rows affected (0.11 sec) mysql> CREATE DATABASE IF NOT EXISTS southwind; Query OK, 1 row affected (0.01 sec) mysql> DROP DATABASE IF EXISTS southwind; Query OK, 0 rows affected (0.00 sec)55, mysql> CREATE DATABASE southwind; Query OK, 1 row affected (0.03 sec) mysql> DROP DATABASE southwind; Query OK, 0 rows affected (0.11 sec) mysql> CREATE DATABASE IF NOT EXISTS southwind; Query OK, 1 row affected (0.01 sec) mysql> DROP DATABASE IF EXISTS southwind; Query OK, 0 rows affected (0.00 sec)56 untuk membandingkan dua string (e. g. , mysql> CREATE DATABASE southwind; Query OK, 1 row affected (0.03 sec) mysql> DROP DATABASE southwind; Query OK, 0 rows affected (0.11 sec) mysql> CREATE DATABASE IF NOT EXISTS southwind; Query OK, 1 row affected (0.01 sec) mysql> DROP DATABASE IF EXISTS southwind; Query OK, 0 rows affected (0.00 sec)_69 Urutan string tergantung pada apa yang disebut susunan yang dipilih. Sebagai contoh, Pencocokan Pola String - SUKA dan TIDAK SUKAUntuk string, selain pencocokan penuh menggunakan operator seperti mysql> CREATE DATABASE southwind; Query OK, 1 row affected (0.03 sec) mysql> DROP DATABASE southwind; Query OK, 0 rows affected (0.11 sec) mysql> CREATE DATABASE IF NOT EXISTS southwind; Query OK, 1 row affected (0.01 sec) mysql> DROP DATABASE IF EXISTS southwind; Query OK, 0 rows affected (0.00 sec)50 dan mysql> CREATE DATABASE southwind; Query OK, 1 row affected (0.03 sec) mysql> DROP DATABASE southwind; Query OK, 0 rows affected (0.11 sec) mysql> CREATE DATABASE IF NOT EXISTS southwind; Query OK, 1 row affected (0.01 sec) mysql> DROP DATABASE IF EXISTS southwind; Query OK, 0 rows affected (0.00 sec)51, kita dapat melakukan pencocokan pola menggunakan operator mysql> CREATE DATABASE southwind; Query OK, 1 row affected (0.03 sec) mysql> DROP DATABASE southwind; Query OK, 0 rows affected (0.11 sec) mysql> CREATE DATABASE IF NOT EXISTS southwind; Query OK, 1 row affected (0.01 sec) mysql> DROP DATABASE IF EXISTS southwind; Query OK, 0 rows affected (0.00 sec)72 (atau mysql> CREATE DATABASE southwind; Query OK, 1 row affected (0.03 sec) mysql> DROP DATABASE southwind; Query OK, 0 rows affected (0.11 sec) mysql> CREATE DATABASE IF NOT EXISTS southwind; Query OK, 1 row affected (0.01 sec) mysql> DROP DATABASE IF EXISTS southwind; Query OK, 0 rows affected (0.00 sec)73) dengan karakter wildcard. Wildcard mysql> CREATE DATABASE southwind; Query OK, 1 row affected (0.03 sec) mysql> DROP DATABASE southwind; Query OK, 0 rows affected (0.11 sec) mysql> CREATE DATABASE IF NOT EXISTS southwind; Query OK, 1 row affected (0.01 sec) mysql> DROP DATABASE IF EXISTS southwind; Query OK, 0 rows affected (0.00 sec)_74 cocok dengan karakter tunggal apa pun; . Sebagai contoh,
MySQL juga mendukung pencocokan ekspresi reguler melalui operator ________13______86 Operator AritmatikaAnda dapat melakukan operasi aritmatika pada bidang numerik menggunakan operator aritmatika, seperti tabel di bawah ini Deskripsi Operator+Penjumlahan-Pengurangan*Perkalian/Pembagian DIVInteger Divisi%Modulus (Sisa)Operator Logika - DAN, ATAU, BUKAN, XORAnda dapat menggabungkan beberapa kondisi dengan operator boolean mysql> CREATE DATABASE southwind; Query OK, 1 row affected (0.03 sec) mysql> DROP DATABASE southwind; Query OK, 0 rows affected (0.11 sec) mysql> CREATE DATABASE IF NOT EXISTS southwind; Query OK, 1 row affected (0.01 sec) mysql> DROP DATABASE IF EXISTS southwind; Query OK, 0 rows affected (0.00 sec)87, mysql> CREATE DATABASE southwind; Query OK, 1 row affected (0.03 sec) mysql> DROP DATABASE southwind; Query OK, 0 rows affected (0.11 sec) mysql> CREATE DATABASE IF NOT EXISTS southwind; Query OK, 1 row affected (0.01 sec) mysql> DROP DATABASE IF EXISTS southwind; Query OK, 0 rows affected (0.00 sec)88, mysql> CREATE DATABASE southwind; Query OK, 1 row affected (0.03 sec) mysql> DROP DATABASE southwind; Query OK, 0 rows affected (0.11 sec) mysql> CREATE DATABASE IF NOT EXISTS southwind; Query OK, 1 row affected (0.01 sec) mysql> DROP DATABASE IF EXISTS southwind; Query OK, 0 rows affected (0.00 sec)89. Anda juga dapat membalikkan kondisi menggunakan operator mysql> CREATE DATABASE southwind; Query OK, 1 row affected (0.03 sec) mysql> DROP DATABASE southwind; Query OK, 0 rows affected (0.11 sec) mysql> CREATE DATABASE IF NOT EXISTS southwind; Query OK, 1 row affected (0.01 sec) mysql> DROP DATABASE IF EXISTS southwind; Query OK, 0 rows affected (0.00 sec)90. Sebagai contoh, mysql> SELECT * FROM products WHERE quantity >= 5000 AND name LIKE 'Pen %'; +-----------+-------------+----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+----------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | | 1002 | PEN | Pen Blue | 8000 | 1.25 | +-----------+-------------+----------+----------+-------+ mysql> SELECT * FROM products WHERE quantity >= 5000 AND price < 1.24 AND name LIKE 'Pen %'; +-----------+-------------+---------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+---------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | +-----------+-------------+---------+----------+-------+ mysql> SELECT * FROM products WHERE NOT (quantity >= 5000 AND name LIKE 'Pen %'); +-----------+-------------+-----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+-----------+----------+-------+ | 1003 | PEN | Pen Black | 2000 | 1.25 | | 1004 | PEC | Pencil 2B | 10000 | 0.48 | | 1005 | PEC | Pencil 2H | 8000 | 0.49 | +-----------+-------------+-----------+----------+-------+_ DI, BUKAN DIAnda dapat memilih dari anggota kumpulan dengan operator ________13______91 (atau ________13______92). Ini lebih mudah dan lebih jelas daripada ekspresi ________13______93 yang setara mysql> SELECT * FROM products WHERE name IN ('Pen Red', 'Pen Black');
+-----------+-------------+-----------+----------+-------+
| productID | productCode | name | quantity | price |
+-----------+-------------+-----------+----------+-------+
| 1001 | PEN | Pen Red | 5000 | 1.23 |
| 1003 | PEN | Pen Black | 2000 | 1.25 |
+-----------+-------------+-----------+----------+-------+ANTARA, BUKAN ANTARAUntuk memeriksa apakah nilainya berada dalam rentang, Anda dapat menggunakan operator mysql> CREATE DATABASE southwind; Query OK, 1 row affected (0.03 sec) mysql> DROP DATABASE southwind; Query OK, 0 rows affected (0.11 sec) mysql> CREATE DATABASE IF NOT EXISTS southwind; Query OK, 1 row affected (0.01 sec) mysql> DROP DATABASE IF EXISTS southwind; Query OK, 0 rows affected (0.00 sec)94. Sekali lagi, ini lebih mudah dan lebih jelas daripada ekspresi mysql> CREATE DATABASE southwind; Query OK, 1 row affected (0.03 sec) mysql> DROP DATABASE southwind; Query OK, 0 rows affected (0.11 sec) mysql> CREATE DATABASE IF NOT EXISTS southwind; Query OK, 1 row affected (0.01 sec) mysql> DROP DATABASE IF EXISTS southwind; Query OK, 0 rows affected (0.00 sec)93 yang setara mysql> SELECT * FROM products
WHERE (price BETWEEN 1.0 AND 2.0) AND (quantity BETWEEN 1000 AND 2000);
+-----------+-------------+-----------+----------+-------+
| productID | productCode | name | quantity | price |
+-----------+-------------+-----------+----------+-------+
| 1003 | PEN | Pen Black | 2000 | 1.25 |
+-----------+-------------+-----------+----------+-------+NULL, BUKAN NULLmysql> CREATE DATABASE southwind; Query OK, 1 row affected (0.03 sec) mysql> DROP DATABASE southwind; Query OK, 0 rows affected (0.11 sec) mysql> CREATE DATABASE IF NOT EXISTS southwind; Query OK, 1 row affected (0.01 sec) mysql> DROP DATABASE IF EXISTS southwind; Query OK, 0 rows affected (0.00 sec)18 adalah nilai khusus, yang mewakili "tidak ada nilai", "nilai yang hilang" atau "nilai tidak diketahui". Anda dapat memeriksa apakah suatu kolom berisi mysql> CREATE DATABASE southwind; Query OK, 1 row affected (0.03 sec) mysql> DROP DATABASE southwind; Query OK, 0 rows affected (0.11 sec) mysql> CREATE DATABASE IF NOT EXISTS southwind; Query OK, 1 row affected (0.01 sec) mysql> DROP DATABASE IF EXISTS southwind; Query OK, 0 rows affected (0.00 sec)_18 oleh mysql> CREATE DATABASE southwind; Query OK, 1 row affected (0.03 sec) mysql> DROP DATABASE southwind; Query OK, 0 rows affected (0.11 sec) mysql> CREATE DATABASE IF NOT EXISTS southwind; Query OK, 1 row affected (0.01 sec) mysql> DROP DATABASE IF EXISTS southwind; Query OK, 0 rows affected (0.00 sec)98 atau mysql> CREATE DATABASE southwind; Query OK, 1 row affected (0.03 sec) mysql> DROP DATABASE southwind; Query OK, 0 rows affected (0.11 sec) mysql> CREATE DATABASE IF NOT EXISTS southwind; Query OK, 1 row affected (0.01 sec) mysql> DROP DATABASE IF EXISTS southwind; Query OK, 0 rows affected (0.00 sec)99. Sebagai contoh, mysql> SELECT * FROM products WHERE productCode IS NULL; Empty set (0.00 sec) Menggunakan operator perbandingan (seperti mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */00 atau mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */01) untuk memeriksa mysql> CREATE DATABASE southwind; Query OK, 1 row affected (0.03 sec) mysql> DROP DATABASE southwind; Query OK, 0 rows affected (0.11 sec) mysql> CREATE DATABASE IF NOT EXISTS southwind; Query OK, 1 row affected (0.01 sec) mysql> DROP DATABASE IF EXISTS southwind; Query OK, 0 rows affected (0.00 sec)18 adalah kesalahan - kesalahan yang sangat umum. Sebagai contoh, ORDER BY KlausulAnda dapat mengurutkan baris yang dipilih menggunakan klausa mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */03, dengan sintaks berikutSELECT .. FROM tableName WHERE criteria ORDER BY columnA ASC|DESC, columnB ASC|DESC, ... Baris yang dipilih akan diurutkan sesuai dengan nilai di mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */04, baik dalam urutan menaik (mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */05) (default) atau menurun (mysql> SELECT * FROM products WHERE name IN ('Pen Red', 'Pen Black');
+-----------+-------------+-----------+----------+-------+
| productID | productCode | name | quantity | price |
+-----------+-------------+-----------+----------+-------+
| 1001 | PEN | Pen Red | 5000 | 1.23 |
| 1003 | PEN | Pen Black | 2000 | 1.25 |
+-----------+-------------+-----------+----------+-------+6). Jika beberapa baris memiliki nilai yang sama di mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */04, maka akan diurutkan menurut mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */08, dan seterusnya. Untuk string, urutannya bisa case-sensitive atau case-insensitive, tergantung pada apa yang disebut urutan susunan karakter yang digunakan. Sebagai contoh,Anda dapat mengacak catatan yang dikembalikan melalui fungsi ________22______09, e. g. , mysql> CREATE DATABASE southwind; Query OK, 1 row affected (0.03 sec) mysql> DROP DATABASE southwind; Query OK, 0 rows affected (0.11 sec) mysql> CREATE DATABASE IF NOT EXISTS southwind; Query OK, 1 row affected (0.01 sec) mysql> DROP DATABASE IF EXISTS southwind; Query OK, 0 rows affected (0.00 sec)0 Klausul LIMITKueri mysql> CREATE DATABASE southwind; Query OK, 1 row affected (0.03 sec) mysql> DROP DATABASE southwind; Query OK, 0 rows affected (0.11 sec) mysql> CREATE DATABASE IF NOT EXISTS southwind; Query OK, 1 row affected (0.01 sec) mysql> DROP DATABASE IF EXISTS southwind; Query OK, 0 rows affected (0.00 sec)_43 pada database besar dapat menghasilkan banyak baris. Anda dapat menggunakan klausa mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */_11 untuk membatasi jumlah baris yang ditampilkan, mis. g. ,Untuk melanjutkan ke rekaman berikut, Anda dapat menentukan jumlah baris yang akan dilewati, diikuti dengan jumlah baris yang akan ditampilkan di klausa mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */11, sebagai berikutAS - AliasAnda dapat menggunakan kata kunci mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */_13 untuk menentukan alias untuk pengidentifikasi (seperti nama kolom, nama tabel). Alias akan digunakan dalam menampilkan nama. Itu juga dapat digunakan sebagai referensi. Sebagai contoh,Perhatikan bahwa pengidentifikasi " mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */14" berisi kosong dan harus tanda kutip balikFungsi CONCAT()Anda juga dapat menggabungkan beberapa kolom sebagai satu (mis. g. , menggabungkan nama belakang dan nama depan) menggunakan fungsi mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */15. Sebagai contoh,mysql> CREATE DATABASE southwind; Query OK, 1 row affected (0.03 sec) mysql> DROP DATABASE southwind; Query OK, 0 rows affected (0.11 sec) mysql> CREATE DATABASE IF NOT EXISTS southwind; Query OK, 1 row affected (0.01 sec) mysql> DROP DATABASE IF EXISTS southwind; Query OK, 0 rows affected (0.00 sec)1 Memproduksi Ringkasan LaporanUntuk menghasilkan laporan ringkasan, kita sering perlu menggabungkan baris terkait BERBEDASebuah kolom mungkin memiliki nilai duplikat, kita dapat menggunakan kata kunci mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */16 untuk memilih hanya nilai yang berbeda. Kami juga dapat menerapkan mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */_16 ke beberapa kolom untuk memilih kombinasi yang berbeda dari kolom ini. Sebagai contoh,KELOMPOK DENGAN KlausulKlausa mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */_18 memungkinkan Anda menciutkan beberapa rekaman dengan nilai yang sama ke dalam grup. Sebagai contoh,mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */_18 dengan sendirinya tidak bermakna. Ini digunakan bersama dengan mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */18 fungsi agregat (seperti mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */21, mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */22, mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */23) untuk menghasilkan ringkasan grupGROUP BY Fungsi Agregat. COUNT, MAX, MIN, AVG, SUM, STD, GROUP_CONCATKita dapat menerapkan mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */18 Fungsi agregat ke setiap grup untuk menghasilkan laporan ringkasan grupFungsi mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */_25 mengembalikan baris yang dipilih; . Sebagai contoh,Selain mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */_21, ada banyak fungsi agregat ________22______18 lainnya seperti mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */22, mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */31, mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */32 dan mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */23. Sebagai contoh,klausa MEMILIKImysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */_34 mirip dengan mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */35, tetapi dapat beroperasi pada fungsi agregat mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */18; DENGAN ROLLUPKlausa mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */_38 menunjukkan ringkasan ringkasan grup, e. g. ,Memodifikasi Data - PEMBARUANUntuk mengubah data yang ada, gunakan perintah ________22______39, dengan sintaks berikut mysql> CREATE DATABASE southwind; Query OK, 1 row affected (0.03 sec) mysql> DROP DATABASE southwind; Query OK, 0 rows affected (0.11 sec) mysql> CREATE DATABASE IF NOT EXISTS southwind; Query OK, 1 row affected (0.01 sec) mysql> DROP DATABASE IF EXISTS southwind; Query OK, 0 rows affected (0.00 sec)2 Sebagai contoh, PERINGATAN. Jika klausa mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */35 dihilangkan dalam perintah mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */41, SEMUA BARIS akan diperbarui. Oleh karena itu, merupakan praktik yang baik untuk mengeluarkan kueri mysql> CREATE DATABASE southwind; Query OK, 1 row affected (0.03 sec) mysql> DROP DATABASE southwind; Query OK, 0 rows affected (0.11 sec) mysql> CREATE DATABASE IF NOT EXISTS southwind; Query OK, 1 row affected (0.01 sec) mysql> DROP DATABASE IF EXISTS southwind; Query OK, 0 rows affected (0.00 sec)43, menggunakan kriteria yang sama, untuk memeriksa rangkaian hasil sebelum mengeluarkan mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */41. Ini juga berlaku untuk pernyataan mysql> SELECT * FROM products WHERE quantity >= 5000 AND name LIKE 'Pen %'; +-----------+-------------+----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+----------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | | 1002 | PEN | Pen Blue | 8000 | 1.25 | +-----------+-------------+----------+----------+-------+ mysql> SELECT * FROM products WHERE quantity >= 5000 AND price < 1.24 AND name LIKE 'Pen %'; +-----------+-------------+---------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+---------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | +-----------+-------------+---------+----------+-------+ mysql> SELECT * FROM products WHERE NOT (quantity >= 5000 AND name LIKE 'Pen %'); +-----------+-------------+-----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+-----------+----------+-------+ | 1003 | PEN | Pen Black | 2000 | 1.25 | | 1004 | PEC | Pencil 2B | 10000 | 0.48 | | 1005 | PEC | Pencil 2H | 8000 | 0.49 | +-----------+-------------+-----------+----------+-------+_8 di bagian berikut Menghapus Baris - HAPUS DARIGunakan perintah mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */_45 untuk menghapus baris dari tabel, dengan sintaks berikutSebagai contoh, Berhati-hatilah bahwa mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */_46" tanpa klausa ________22______35 menghapus SEMUA catatan dari tabel. Bahkan dengan klausa mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */_35, Anda mungkin telah menghapus beberapa catatan secara tidak sengaja. Itu selalu disarankan untuk mengeluarkan perintah mysql> CREATE DATABASE southwind; Query OK, 1 row affected (0.03 sec) mysql> DROP DATABASE southwind; Query OK, 0 rows affected (0.11 sec) mysql> CREATE DATABASE IF NOT EXISTS southwind; Query OK, 1 row affected (0.01 sec) mysql> DROP DATABASE IF EXISTS southwind; Query OK, 0 rows affected (0.00 sec)_43 dengan klausa mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */35 yang sama untuk memeriksa kumpulan hasil sebelum mengeluarkan mysql> SELECT * FROM products WHERE quantity >= 5000 AND name LIKE 'Pen %'; +-----------+-------------+----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+----------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | | 1002 | PEN | Pen Blue | 8000 | 1.25 | +-----------+-------------+----------+----------+-------+ mysql> SELECT * FROM products WHERE quantity >= 5000 AND price < 1.24 AND name LIKE 'Pen %'; +-----------+-------------+---------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+---------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | +-----------+-------------+---------+----------+-------+ mysql> SELECT * FROM products WHERE NOT (quantity >= 5000 AND name LIKE 'Pen %'); +-----------+-------------+-----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+-----------+----------+-------+ | 1003 | PEN | Pen Black | 2000 | 1.25 | | 1004 | PEC | Pencil 2B | 10000 | 0.48 | | 1005 | PEC | Pencil 2H | 8000 | 0.49 | +-----------+-------------+-----------+----------+-------+8 (dan mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */41)Memuat/Mengekspor Data dari/ke File TeksAda beberapa cara untuk menambahkan data ke dalam database. (a) mengeluarkan perintah mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */_53 secara manual; MUAT INFILE DATA LOKAL. KE TABELSelain menggunakan perintah mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */_53 untuk menyisipkan baris, Anda dapat menyimpan data mentah Anda dalam file teks, dan memuatnya ke dalam tabel melalui perintah mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */55. Misalnya, gunakan editor teks untuk MEMBUAT FILE BARU yang disebut "mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */59", di bawah "mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */60" (untuk Windows) atau "mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */61" (untuk Mac), yang berisi catatan berikut, di mana nilainya dipisahkan oleh mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */62. Ekstensi file "mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */63" adalah singkatan dari file teks Comma-Separated Valuesmysql> CREATE DATABASE southwind; Query OK, 1 row affected (0.03 sec) mysql> DROP DATABASE southwind; Query OK, 0 rows affected (0.11 sec) mysql> CREATE DATABASE IF NOT EXISTS southwind; Query OK, 1 row affected (0.01 sec) mysql> DROP DATABASE IF EXISTS southwind; Query OK, 0 rows affected (0.00 sec)3 Anda dapat memuat data mentah ke dalam tabel mysql> SELECT * FROM products WHERE quantity >= 5000 AND name LIKE 'Pen %'; +-----------+-------------+----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+----------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | | 1002 | PEN | Pen Blue | 8000 | 1.25 | +-----------+-------------+----------+----------+-------+ mysql> SELECT * FROM products WHERE quantity >= 5000 AND price < 1.24 AND name LIKE 'Pen %'; +-----------+-------------+---------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+---------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | +-----------+-------------+---------+----------+-------+ mysql> SELECT * FROM products WHERE NOT (quantity >= 5000 AND name LIKE 'Pen %'); +-----------+-------------+-----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+-----------+----------+-------+ | 1003 | PEN | Pen Black | 2000 | 1.25 | | 1004 | PEC | Pencil 2B | 10000 | 0.48 | | 1005 | PEC | Pencil 2H | 8000 | 0.49 | +-----------+-------------+-----------+----------+-------+2 sebagai berikut mysql> CREATE DATABASE southwind; Query OK, 1 row affected (0.03 sec) mysql> DROP DATABASE southwind; Query OK, 0 rows affected (0.11 sec) mysql> CREATE DATABASE IF NOT EXISTS southwind; Query OK, 1 row affected (0.01 sec) mysql> DROP DATABASE IF EXISTS southwind; Query OK, 0 rows affected (0.00 sec)4 Catatan
Program Utilitas mysqlimportAnda juga dapat menggunakan program utilitas mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */56 untuk memuat data dari file teksmysql> CREATE DATABASE southwind; Query OK, 1 row affected (0.03 sec) mysql> DROP DATABASE southwind; Query OK, 0 rows affected (0.11 sec) mysql> CREATE DATABASE IF NOT EXISTS southwind; Query OK, 1 row affected (0.01 sec) mysql> DROP DATABASE IF EXISTS southwind; Query OK, 0 rows affected (0.00 sec)5 PILIH. KE OUTFILEMemuji mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */55 perintah, Anda dapat menggunakan mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */75 untuk mengekspor data dari tabel ke file teks. Sebagai contoh,mysql> CREATE DATABASE southwind; Query OK, 1 row affected (0.03 sec) mysql> DROP DATABASE southwind; Query OK, 0 rows affected (0.11 sec) mysql> CREATE DATABASE IF NOT EXISTS southwind; Query OK, 1 row affected (0.01 sec) mysql> DROP DATABASE IF EXISTS southwind; Query OK, 0 rows affected (0.00 sec)6 Menjalankan Skrip SQLAlih-alih memasukkan setiap pernyataan SQL secara manual, Anda dapat menyimpan banyak pernyataan SQL dalam file teks, yang disebut skrip SQL, dan menjalankan skrip. Misalnya, gunakan editor teks pemrograman untuk menyiapkan skrip berikut dan simpan sebagai " mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */76" di bawah "mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */60" (untuk Windows) atau "mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */61" (untuk Mac)mysql> CREATE DATABASE southwind; Query OK, 1 row affected (0.03 sec) mysql> DROP DATABASE southwind; Query OK, 0 rows affected (0.11 sec) mysql> CREATE DATABASE IF NOT EXISTS southwind; Query OK, 1 row affected (0.01 sec) mysql> DROP DATABASE IF EXISTS southwind; Query OK, 0 rows affected (0.00 sec)7 Anda juga dapat menjalankan skrip
Lebih Dari Satu MejaContoh kita sejauh ini hanya melibatkan satu tabel " mysql> SELECT * FROM products WHERE quantity >= 5000 AND name LIKE 'Pen %'; +-----------+-------------+----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+----------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | | 1002 | PEN | Pen Blue | 8000 | 1.25 | +-----------+-------------+----------+----------+-------+ mysql> SELECT * FROM products WHERE quantity >= 5000 AND price < 1.24 AND name LIKE 'Pen %'; +-----------+-------------+---------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+---------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | +-----------+-------------+---------+----------+-------+ mysql> SELECT * FROM products WHERE NOT (quantity >= 5000 AND name LIKE 'Pen %'); +-----------+-------------+-----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+-----------+----------+-------+ | 1003 | PEN | Pen Black | 2000 | 1.25 | | 1004 | PEC | Pencil 2B | 10000 | 0.48 | | 1005 | PEC | Pencil 2H | 8000 | 0.49 | +-----------+-------------+-----------+----------+-------+2". Database praktis berisi banyak tabel terkait Produk memiliki pemasok. Jika setiap produk memiliki satu pemasok, dan setiap pemasok hanya memasok satu produk (dikenal sebagai hubungan satu-ke-satu), kita cukup menambahkan data pemasok (nama, alamat, nomor telepon) ke dalam tabel mysql> SELECT * FROM products WHERE quantity >= 5000 AND name LIKE 'Pen %'; +-----------+-------------+----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+----------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | | 1002 | PEN | Pen Blue | 8000 | 1.25 | +-----------+-------------+----------+----------+-------+ mysql> SELECT * FROM products WHERE quantity >= 5000 AND price < 1.24 AND name LIKE 'Pen %'; +-----------+-------------+---------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+---------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | +-----------+-------------+---------+----------+-------+ mysql> SELECT * FROM products WHERE NOT (quantity >= 5000 AND name LIKE 'Pen %'); +-----------+-------------+-----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+-----------+----------+-------+ | 1003 | PEN | Pen Black | 2000 | 1.25 | | 1004 | PEC | Pencil 2B | 10000 | 0.48 | | 1005 | PEC | Pencil 2H | 8000 | 0.49 | +-----------+-------------+-----------+----------+-------+2. Misalkan setiap produk memiliki satu pemasok, dan pemasok dapat memasok nol atau lebih produk (dikenal sebagai hubungan satu-ke-banyak). Menempatkan data pemasok ke dalam tabel mysql> SELECT * FROM products WHERE quantity >= 5000 AND name LIKE 'Pen %'; +-----------+-------------+----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+----------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | | 1002 | PEN | Pen Blue | 8000 | 1.25 | +-----------+-------------+----------+----------+-------+ mysql> SELECT * FROM products WHERE quantity >= 5000 AND price < 1.24 AND name LIKE 'Pen %'; +-----------+-------------+---------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+---------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | +-----------+-------------+---------+----------+-------+ mysql> SELECT * FROM products WHERE NOT (quantity >= 5000 AND name LIKE 'Pen %'); +-----------+-------------+-----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+-----------+----------+-------+ | 1003 | PEN | Pen Black | 2000 | 1.25 | | 1004 | PEC | Pencil 2B | 10000 | 0.48 | | 1005 | PEC | Pencil 2H | 8000 | 0.49 | +-----------+-------------+-----------+----------+-------+_2 mengakibatkan duplikasi data. Hal ini karena satu pemasok dapat memasok banyak produk, sehingga data pemasok yang sama muncul dalam banyak baris. Ini tidak hanya memboroskan penyimpanan tetapi juga dengan mudah menyebabkan inkonsistensi (karena semua data duplikat harus diperbarui secara bersamaan). Situasi menjadi lebih rumit jika satu produk memiliki banyak pemasok, dan masing-masing pemasok dapat memasok banyak produk, dalam hubungan banyak-ke-banyak. Relasi Satu Ke BanyakMisalkan setiap produk memiliki satu pemasok, dan setiap pemasok memasok satu atau lebih produk. Kita bisa membuat tabel bernama mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */_85 untuk menyimpan data pemasok (mis. g. , nama, alamat, dan nomor telepon). Kami membuat kolom dengan nilai unik yang disebut mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */86 untuk mengidentifikasi setiap pemasok. Kami menetapkan mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */_86 sebagai kunci utama untuk tabel mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */85 (untuk memastikan keunikan dan memfasilitasi pencarian cepat)Untuk menghubungkan tabel mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */_85 dengan tabel mysql> SELECT * FROM products WHERE quantity >= 5000 AND name LIKE 'Pen %'; +-----------+-------------+----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+----------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | | 1002 | PEN | Pen Blue | 8000 | 1.25 | +-----------+-------------+----------+----------+-------+ mysql> SELECT * FROM products WHERE quantity >= 5000 AND price < 1.24 AND name LIKE 'Pen %'; +-----------+-------------+---------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+---------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | +-----------+-------------+---------+----------+-------+ mysql> SELECT * FROM products WHERE NOT (quantity >= 5000 AND name LIKE 'Pen %'); +-----------+-------------+-----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+-----------+----------+-------+ | 1003 | PEN | Pen Black | 2000 | 1.25 | | 1004 | PEC | Pencil 2B | 10000 | 0.48 | | 1005 | PEC | Pencil 2H | 8000 | 0.49 | +-----------+-------------+-----------+----------+-------+2, kita menambahkan kolom baru ke dalam tabel mysql> SELECT * FROM products WHERE quantity >= 5000 AND name LIKE 'Pen %'; +-----------+-------------+----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+----------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | | 1002 | PEN | Pen Blue | 8000 | 1.25 | +-----------+-------------+----------+----------+-------+ mysql> SELECT * FROM products WHERE quantity >= 5000 AND price < 1.24 AND name LIKE 'Pen %'; +-----------+-------------+---------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+---------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | +-----------+-------------+---------+----------+-------+ mysql> SELECT * FROM products WHERE NOT (quantity >= 5000 AND name LIKE 'Pen %'); +-----------+-------------+-----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+-----------+----------+-------+ | 1003 | PEN | Pen Black | 2000 | 1.25 | | 1004 | PEC | Pencil 2B | 10000 | 0.48 | | 1005 | PEC | Pencil 2H | 8000 | 0.49 | +-----------+-------------+-----------+----------+-------+2 - tabel mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */86. Kami kemudian mengatur kolom mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */86 dari tabel mysql> SELECT * FROM products WHERE quantity >= 5000 AND name LIKE 'Pen %'; +-----------+-------------+----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+----------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | | 1002 | PEN | Pen Blue | 8000 | 1.25 | +-----------+-------------+----------+----------+-------+ mysql> SELECT * FROM products WHERE quantity >= 5000 AND price < 1.24 AND name LIKE 'Pen %'; +-----------+-------------+---------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+---------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | +-----------+-------------+---------+----------+-------+ mysql> SELECT * FROM products WHERE NOT (quantity >= 5000 AND name LIKE 'Pen %'); +-----------+-------------+-----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+-----------+----------+-------+ | 1003 | PEN | Pen Black | 2000 | 1.25 | | 1004 | PEC | Pencil 2B | 10000 | 0.48 | | 1005 | PEC | Pencil 2H | 8000 | 0.49 | +-----------+-------------+-----------+----------+-------+2 sebagai kunci asing yang mereferensikan kolom mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */86 dari tabel mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */85 untuk memastikan apa yang disebut integritas referensialBasis data. angin selatanMeja. ID pemasokpemasok INTname VARCHAR(3)telepon CHAR(8)501ABC Traders88881111502XYZ Company88882222503QQ Corp88883333 Basis data. angin selatan Meja. ID produk produk INTproductCode Nama CHAR(3). VARCHAR(30) kuantitas INTharga DECIMAL(10,2)ID pemasok INT (Kunci Asing)2001PECPencil 3B5000. 525012002PECPencil 4B2000. 625012003PECPensil 5B1000. 735012004PECPensil 6B5000. 47502 Pertama-tama kita harus membuat tabel mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */_85, karena tabel mysql> SELECT * FROM products WHERE quantity >= 5000 AND name LIKE 'Pen %'; +-----------+-------------+----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+----------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | | 1002 | PEN | Pen Blue | 8000 | 1.25 | +-----------+-------------+----------+----------+-------+ mysql> SELECT * FROM products WHERE quantity >= 5000 AND price < 1.24 AND name LIKE 'Pen %'; +-----------+-------------+---------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+---------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | +-----------+-------------+---------+----------+-------+ mysql> SELECT * FROM products WHERE NOT (quantity >= 5000 AND name LIKE 'Pen %'); +-----------+-------------+-----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+-----------+----------+-------+ | 1003 | PEN | Pen Black | 2000 | 1.25 | | 1004 | PEC | Pencil 2B | 10000 | 0.48 | | 1005 | PEC | Pencil 2H | 8000 | 0.49 | +-----------+-------------+-----------+----------+-------+2 mereferensikan tabel ________22______85. Tabel mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */_85 dikenal sebagai tabel induk; mysql> CREATE DATABASE southwind; Query OK, 1 row affected (0.03 sec) mysql> DROP DATABASE southwind; Query OK, 0 rows affected (0.11 sec) mysql> CREATE DATABASE IF NOT EXISTS southwind; Query OK, 1 row affected (0.01 sec) mysql> DROP DATABASE IF EXISTS southwind; Query OK, 0 rows affected (0.00 sec)_9 MENGUBAH TABELAlih-alih menghapus dan membuat ulang tabel mysql> SELECT * FROM products WHERE quantity >= 5000 AND name LIKE 'Pen %'; +-----------+-------------+----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+----------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | | 1002 | PEN | Pen Blue | 8000 | 1.25 | +-----------+-------------+----------+----------+-------+ mysql> SELECT * FROM products WHERE quantity >= 5000 AND price < 1.24 AND name LIKE 'Pen %'; +-----------+-------------+---------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+---------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | +-----------+-------------+---------+----------+-------+ mysql> SELECT * FROM products WHERE NOT (quantity >= 5000 AND name LIKE 'Pen %'); +-----------+-------------+-----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+-----------+----------+-------+ | 1003 | PEN | Pen Black | 2000 | 1.25 | | 1004 | PEC | Pencil 2B | 10000 | 0.48 | | 1005 | PEC | Pencil 2H | 8000 | 0.49 | +-----------+-------------+-----------+----------+-------+2, kami akan menggunakan " INSERT INTO tableName VALUES (row1FirstColumnValue, ..., row1lastColumnValue), (row2FirstColumnValue, ..., row2lastColumnValue), ...03" untuk menambahkan kolom baru mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */86 ke dalam tabel mysql> SELECT * FROM products WHERE quantity >= 5000 AND name LIKE 'Pen %'; +-----------+-------------+----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+----------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | | 1002 | PEN | Pen Blue | 8000 | 1.25 | +-----------+-------------+----------+----------+-------+ mysql> SELECT * FROM products WHERE quantity >= 5000 AND price < 1.24 AND name LIKE 'Pen %'; +-----------+-------------+---------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+---------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | +-----------+-------------+---------+----------+-------+ mysql> SELECT * FROM products WHERE NOT (quantity >= 5000 AND name LIKE 'Pen %'); +-----------+-------------+-----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+-----------+----------+-------+ | 1003 | PEN | Pen Black | 2000 | 1.25 | | 1004 | PEC | Pencil 2B | 10000 | 0.48 | | 1005 | PEC | Pencil 2H | 8000 | 0.49 | +-----------+-------------+-----------+----------+-------+2 mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */_0Selanjutnya, kita akan menambahkan batasan kunci asing pada kolom mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */86 dari tabel anak mysql> SELECT * FROM products WHERE quantity >= 5000 AND name LIKE 'Pen %'; +-----------+-------------+----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+----------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | | 1002 | PEN | Pen Blue | 8000 | 1.25 | +-----------+-------------+----------+----------+-------+ mysql> SELECT * FROM products WHERE quantity >= 5000 AND price < 1.24 AND name LIKE 'Pen %'; +-----------+-------------+---------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+---------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | +-----------+-------------+---------+----------+-------+ mysql> SELECT * FROM products WHERE NOT (quantity >= 5000 AND name LIKE 'Pen %'); +-----------+-------------+-----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+-----------+----------+-------+ | 1003 | PEN | Pen Black | 2000 | 1.25 | | 1004 | PEC | Pencil 2B | 10000 | 0.48 | | 1005 | PEC | Pencil 2H | 8000 | 0.49 | +-----------+-------------+-----------+----------+-------+2 ke tabel induk mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */85, untuk memastikan bahwa setiap mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */86 di tabel mysql> SELECT * FROM products WHERE quantity >= 5000 AND name LIKE 'Pen %'; +-----------+-------------+----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+----------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | | 1002 | PEN | Pen Blue | 8000 | 1.25 | +-----------+-------------+----------+----------+-------+ mysql> SELECT * FROM products WHERE quantity >= 5000 AND price < 1.24 AND name LIKE 'Pen %'; +-----------+-------------+---------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+---------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | +-----------+-------------+---------+----------+-------+ mysql> SELECT * FROM products WHERE NOT (quantity >= 5000 AND name LIKE 'Pen %'); +-----------+-------------+-----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+-----------+----------+-------+ | 1003 | PEN | Pen Black | 2000 | 1.25 | | 1004 | PEC | Pencil 2B | 10000 | 0.48 | | 1005 | PEC | Pencil 2H | 8000 | 0.49 | +-----------+-------------+-----------+----------+-------+2 selalu merujuk ke mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */86 yang valid di mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */85 tabel - ini disebut integritas referensiSebelum kita dapat menambahkan kunci asing, kita perlu mengatur mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */86 dari catatan yang ada di tabel mysql> SELECT * FROM products WHERE quantity >= 5000 AND name LIKE 'Pen %'; +-----------+-------------+----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+----------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | | 1002 | PEN | Pen Blue | 8000 | 1.25 | +-----------+-------------+----------+----------+-------+ mysql> SELECT * FROM products WHERE quantity >= 5000 AND price < 1.24 AND name LIKE 'Pen %'; +-----------+-------------+---------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+---------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | +-----------+-------------+---------+----------+-------+ mysql> SELECT * FROM products WHERE NOT (quantity >= 5000 AND name LIKE 'Pen %'); +-----------+-------------+-----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+-----------+----------+-------+ | 1003 | PEN | Pen Black | 2000 | 1.25 | | 1004 | PEC | Pencil 2B | 10000 | 0.48 | | 1005 | PEC | Pencil 2H | 8000 | 0.49 | +-----------+-------------+-----------+----------+-------+2 ke mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */86 yang valid di tabel (katakanlah INSERT INTO tableName VALUES (row1FirstColumnValue, ..., row1lastColumnValue), (row2FirstColumnValue, ..., row2lastColumnValue), ...16) PILIH dengan GABUNGmysql> CREATE DATABASE southwind; Query OK, 1 row affected (0.03 sec) mysql> DROP DATABASE southwind; Query OK, 0 rows affected (0.11 sec) mysql> CREATE DATABASE IF NOT EXISTS southwind; Query OK, 1 row affected (0.01 sec) mysql> DROP DATABASE IF EXISTS southwind; Query OK, 0 rows affected (0.00 sec)43 perintah dapat digunakan untuk kueri dan menggabungkan data dari dua tabel terkait. Misalnya, untuk mencantumkan produk SELECT .. FROM tableName WHERE criteria ORDER BY columnA ASC|DESC, columnB ASC|DESC, ..._5 (dalam tabel mysql> SELECT * FROM products WHERE quantity >= 5000 AND name LIKE 'Pen %'; +-----------+-------------+----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+----------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | | 1002 | PEN | Pen Blue | 8000 | 1.25 | +-----------+-------------+----------+----------+-------+ mysql> SELECT * FROM products WHERE quantity >= 5000 AND price < 1.24 AND name LIKE 'Pen %'; +-----------+-------------+---------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+---------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | +-----------+-------------+---------+----------+-------+ mysql> SELECT * FROM products WHERE NOT (quantity >= 5000 AND name LIKE 'Pen %'); +-----------+-------------+-----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+-----------+----------+-------+ | 1003 | PEN | Pen Black | 2000 | 1.25 | | 1004 | PEC | Pencil 2B | 10000 | 0.48 | | 1005 | PEC | Pencil 2H | 8000 | 0.49 | +-----------+-------------+-----------+----------+-------+2) dan pemasok SELECT .. FROM tableName WHERE criteria ORDER BY columnA ASC|DESC, columnB ASC|DESC, ...5 (dalam tabel mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */85), kita dapat menggabungkan dua tabel melalui dua kolom umum mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */86Dalam hasil kueri di atas, dua kolom memiliki tajuk yang sama " SELECT .. FROM tableName WHERE criteria ORDER BY columnA ASC|DESC, columnB ASC|DESC, ...5". Kita bisa membuat alias untuk heading Diagram database seperti yang diilustrasikan. Tautan menunjukkan hubungan satu-ke-banyak antara mysql> SELECT * FROM products WHERE quantity >= 5000 AND name LIKE 'Pen %'; +-----------+-------------+----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+----------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | | 1002 | PEN | Pen Blue | 8000 | 1.25 | +-----------+-------------+----------+----------+-------+ mysql> SELECT * FROM products WHERE quantity >= 5000 AND price < 1.24 AND name LIKE 'Pen %'; +-----------+-------------+---------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+---------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | +-----------+-------------+---------+----------+-------+ mysql> SELECT * FROM products WHERE NOT (quantity >= 5000 AND name LIKE 'Pen %'); +-----------+-------------+-----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+-----------+----------+-------+ | 1003 | PEN | Pen Black | 2000 | 1.25 | | 1004 | PEC | Pencil 2B | 10000 | 0.48 | | 1005 | PEC | Pencil 2H | 8000 | 0.49 | +-----------+-------------+-----------+----------+-------+2 dan mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */85 Relasi Banyak ke BanyakMisalkan suatu produk memiliki banyak pemasok; . Solusi di atas rusak. Anda tidak dapat menyertakan mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */86 dalam tabel mysql> SELECT * FROM products WHERE quantity >= 5000 AND name LIKE 'Pen %'; +-----------+-------------+----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+----------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | | 1002 | PEN | Pen Blue | 8000 | 1.25 | +-----------+-------------+----------+----------+-------+ mysql> SELECT * FROM products WHERE quantity >= 5000 AND price < 1.24 AND name LIKE 'Pen %'; +-----------+-------------+---------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+---------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | +-----------+-------------+---------+----------+-------+ mysql> SELECT * FROM products WHERE NOT (quantity >= 5000 AND name LIKE 'Pen %'); +-----------+-------------+-----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+-----------+----------+-------+ | 1003 | PEN | Pen Black | 2000 | 1.25 | | 1004 | PEC | Pencil 2B | 10000 | 0.48 | | 1005 | PEC | Pencil 2H | 8000 | 0.49 | +-----------+-------------+-----------+----------+-------+2, karena Anda tidak dapat menentukan jumlah pemasok, dan karenanya, jumlah kolom yang diperlukan untuk mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */86s. Demikian pula, Anda tidak dapat memasukkan SELECT .. FROM tableName WHERE criteria ORDER BY columnA ASC|DESC, columnB ASC|DESC, ..._3 dalam tabel mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */85, karena Anda tidak dapat menentukan jumlah produkUntuk mengatasi masalah ini, Anda perlu membuat tabel baru, yang dikenal sebagai tabel persimpangan (atau tabel gabungan), untuk menyediakan tautan. Sebut saja tabel persimpangan INSERT INTO tableName VALUES (row1FirstColumnValue, ..., row1lastColumnValue), (row2FirstColumnValue, ..., row2lastColumnValue), ...31, seperti yang diilustrasikanBasis data. angin selatan Meja. product_suppliersproductID INT ID pemasok (Kunci Asing). INT (Kunci Asing)20015012002501200350120045022001503 Basis data. angin selatan Meja. ID pemasokpemasok INTname VARCHAR(30)telepon CHAR(8)501ABC Traders88881111502XYZ Company88882222503QQ Corp88883333 Basis data. angin selatan Meja. ID produk produk INTproductCode Nama CHAR(3). VARCHAR(30) kuantitas INTharga DECIMAL(10,2)2001PECPensil 3B5000. 522002PECPencil 4B2000. 622003PEPensil 5B1000. 732004PECPensil 6B5000. 47 Mari buat tabel INSERT INTO tableName VALUES (row1FirstColumnValue, ..., row1lastColumnValue), (row2FirstColumnValue, ..., row2lastColumnValue), ..._31. Kunci utama tabel terdiri dari dua kolom. SELECT .. FROM tableName WHERE criteria ORDER BY columnA ASC|DESC, columnB ASC|DESC, ...3 dan mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */86, karena kombinasinya secara unik mengidentifikasi setiap baris. Kunci utama ini didefinisikan untuk memastikan keunikan. Dua kunci asing didefinisikan untuk mengatur batasan ke dua tabel indukSelanjutnya, hapus kolom mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */_86 dari tabel mysql> SELECT * FROM products WHERE quantity >= 5000 AND name LIKE 'Pen %'; +-----------+-------------+----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+----------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | | 1002 | PEN | Pen Blue | 8000 | 1.25 | +-----------+-------------+----------+----------+-------+ mysql> SELECT * FROM products WHERE quantity >= 5000 AND price < 1.24 AND name LIKE 'Pen %'; +-----------+-------------+---------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+---------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | +-----------+-------------+---------+----------+-------+ mysql> SELECT * FROM products WHERE NOT (quantity >= 5000 AND name LIKE 'Pen %'); +-----------+-------------+-----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+-----------+----------+-------+ | 1003 | PEN | Pen Black | 2000 | 1.25 | | 1004 | PEC | Pencil 2B | 10000 | 0.48 | | 1005 | PEC | Pencil 2H | 8000 | 0.49 | +-----------+-------------+-----------+----------+-------+2. (Kolom ini ditambahkan untuk menetapkan hubungan satu-ke-banyak. Itu tidak lagi diperlukan dalam hubungan banyak-ke-banyak. ) Sebelum kolom ini dapat dihapus, Anda harus menghapus kunci asing yang dibuat di kolom ini. Untuk menghapus kunci di MySQL, Anda perlu mengetahui nama batasannya, yang dibuat oleh sistem. Untuk menemukan nama kendala, keluarkan " INSERT INTO tableName VALUES (row1FirstColumnValue, ..., row1lastColumnValue), (row2FirstColumnValue, ..., row2lastColumnValue), ...37" dan catat nama kendala kunci asing di klausa " INSERT INTO tableName VALUES (row1FirstColumnValue, ..., row1lastColumnValue), (row2FirstColumnValue, ..., row2lastColumnValue), ...38". Anda kemudian dapat melepaskan kunci asing menggunakan " INSERT INTO tableName VALUES (row1FirstColumnValue, ..., row1lastColumnValue), (row2FirstColumnValue, ..., row2lastColumnValue), ...39" mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */_1Sekarang, kita dapat menghapus kolom redundan ________22______86 kolom mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */_2MemintaDemikian pula, kita dapat menggunakan mysql> CREATE DATABASE southwind; Query OK, 1 row affected (0.03 sec) mysql> DROP DATABASE southwind; Query OK, 0 rows affected (0.11 sec) mysql> CREATE DATABASE IF NOT EXISTS southwind; Query OK, 1 row affected (0.01 sec) mysql> DROP DATABASE IF EXISTS southwind; Query OK, 0 rows affected (0.00 sec)_43 dengan INSERT INTO tableName VALUES (row1FirstColumnValue, ..., row1lastColumnValue), (row2FirstColumnValue, ..., row2lastColumnValue), ...42 untuk meminta data dari 3 tabel, misalnya, Diagram basis data adalah sebagai berikut. Baik tabel mysql> SELECT * FROM products WHERE quantity >= 5000 AND name LIKE 'Pen %'; +-----------+-------------+----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+----------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | | 1002 | PEN | Pen Blue | 8000 | 1.25 | +-----------+-------------+----------+----------+-------+ mysql> SELECT * FROM products WHERE quantity >= 5000 AND price < 1.24 AND name LIKE 'Pen %'; +-----------+-------------+---------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+---------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | +-----------+-------------+---------+----------+-------+ mysql> SELECT * FROM products WHERE NOT (quantity >= 5000 AND name LIKE 'Pen %'); +-----------+-------------+-----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+-----------+----------+-------+ | 1003 | PEN | Pen Black | 2000 | 1.25 | | 1004 | PEC | Pencil 2B | 10000 | 0.48 | | 1005 | PEC | Pencil 2H | 8000 | 0.49 | +-----------+-------------+-----------+----------+-------+2 dan mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */85 menunjukkan hubungan satu-ke-banyak ke tabel persimpangan. Hubungan banyak-ke-banyak didukung melalui tabel persimpanganHubungan Satu-ke-satuMisalkan beberapa produk memiliki data opsional (mis. g. , foto, komentar). Alih-alih menyimpan data opsional ini di tabel mysql> SELECT * FROM products WHERE quantity >= 5000 AND name LIKE 'Pen %'; +-----------+-------------+----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+----------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | | 1002 | PEN | Pen Blue | 8000 | 1.25 | +-----------+-------------+----------+----------+-------+ mysql> SELECT * FROM products WHERE quantity >= 5000 AND price < 1.24 AND name LIKE 'Pen %'; +-----------+-------------+---------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+---------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | +-----------+-------------+---------+----------+-------+ mysql> SELECT * FROM products WHERE NOT (quantity >= 5000 AND name LIKE 'Pen %'); +-----------+-------------+-----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+-----------+----------+-------+ | 1003 | PEN | Pen Black | 2000 | 1.25 | | 1004 | PEC | Pencil 2B | 10000 | 0.48 | | 1005 | PEC | Pencil 2H | 8000 | 0.49 | +-----------+-------------+-----------+----------+-------+_2, lebih efisien untuk membuat tabel lain bernama INSERT INTO tableName VALUES (row1FirstColumnValue, ..., row1lastColumnValue), (row2FirstColumnValue, ..., row2lastColumnValue), ...46s, dan menautkannya ke mysql> SELECT * FROM products WHERE quantity >= 5000 AND name LIKE 'Pen %'; +-----------+-------------+----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+----------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | | 1002 | PEN | Pen Blue | 8000 | 1.25 | +-----------+-------------+----------+----------+-------+ mysql> SELECT * FROM products WHERE quantity >= 5000 AND price < 1.24 AND name LIKE 'Pen %'; +-----------+-------------+---------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+---------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | +-----------+-------------+---------+----------+-------+ mysql> SELECT * FROM products WHERE NOT (quantity >= 5000 AND name LIKE 'Pen %'); +-----------+-------------+-----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+-----------+----------+-------+ | 1003 | PEN | Pen Black | 2000 | 1.25 | | 1004 | PEC | Pencil 2B | 10000 | 0.48 | | 1005 | PEC | Pencil 2H | 8000 | 0.49 | +-----------+-------------+-----------+----------+-------+2 dengan hubungan satu-ke-satu, seperti yang diilustrasikan mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */_3Cadangkan dan PulihkanCadangan. Sebelum kita menyimpulkan contoh ini, mari kita jalankan program utilitas INSERT INTO tableName VALUES (row1FirstColumnValue, ..., row1lastColumnValue), (row2FirstColumnValue, ..., row2lastColumnValue), ...48 untuk membuang (mencadangkan) seluruh database mysql> SELECT * FROM products WHERE quantity >= 5000 AND name LIKE 'Pen %'; +-----------+-------------+----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+----------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | | 1002 | PEN | Pen Blue | 8000 | 1.25 | +-----------+-------------+----------+----------+-------+ mysql> SELECT * FROM products WHERE quantity >= 5000 AND price < 1.24 AND name LIKE 'Pen %'; +-----------+-------------+---------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+---------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | +-----------+-------------+---------+----------+-------+ mysql> SELECT * FROM products WHERE NOT (quantity >= 5000 AND name LIKE 'Pen %'); +-----------+-------------+-----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+-----------+----------+-------+ | 1003 | PEN | Pen Black | 2000 | 1.25 | | 1004 | PEC | Pencil 2B | 10000 | 0.48 | | 1005 | PEC | Pencil 2H | 8000 | 0.49 | +-----------+-------------+-----------+----------+-------+1 mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */_4Pelajari file output, yang berisi mysql> SELECT * FROM products WHERE quantity >= 5000 AND name LIKE 'Pen %'; +-----------+-------------+----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+----------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | | 1002 | PEN | Pen Blue | 8000 | 1.25 | +-----------+-------------+----------+----------+-------+ mysql> SELECT * FROM products WHERE quantity >= 5000 AND price < 1.24 AND name LIKE 'Pen %'; +-----------+-------------+---------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+---------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | +-----------+-------------+---------+----------+-------+ mysql> SELECT * FROM products WHERE NOT (quantity >= 5000 AND name LIKE 'Pen %'); +-----------+-------------+-----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+-----------+----------+-------+ | 1003 | PEN | Pen Black | 2000 | 1.25 | | 1004 | PEC | Pencil 2B | 10000 | 0.48 | | 1005 | PEC | Pencil 2H | 8000 | 0.49 | +-----------+-------------+-----------+----------+-------+_9, mysql> CREATE DATABASE southwind; Query OK, 1 row affected (0.03 sec) mysql> DROP DATABASE southwind; Query OK, 0 rows affected (0.11 sec) mysql> CREATE DATABASE IF NOT EXISTS southwind; Query OK, 1 row affected (0.01 sec) mysql> DROP DATABASE IF EXISTS southwind; Query OK, 0 rows affected (0.00 sec)33 dan mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */53 pernyataan untuk membuat ulang tabel yang dibuangSYNTAX untuk program utilitas ________99______48 adalah sebagai berikut mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */_5Memulihkan. Utilitas INSERT INTO tableName VALUES (row1FirstColumnValue, ..., row1lastColumnValue), (row2FirstColumnValue, ..., row2lastColumnValue), ...48 menghasilkan skrip SQL (terdiri dari mysql> CREATE DATABASE southwind; Query OK, 1 row affected (0.03 sec) mysql> DROP DATABASE southwind; Query OK, 0 rows affected (0.11 sec) mysql> CREATE DATABASE IF NOT EXISTS southwind; Query OK, 1 row affected (0.01 sec) mysql> DROP DATABASE IF EXISTS southwind; Query OK, 0 rows affected (0.00 sec)33 dan mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */53 perintah untuk membuat ulang tabel dan memuat datanya). Anda juga dapat memulihkan dari cadangan dengan menjalankan skrip
Lebih lanjut tentang Kunci Utama, Kunci Asing, dan IndeksKunci utamaDalam model relasional, tabel tidak boleh berisi baris duplikat, karena akan menimbulkan ambiguitas dalam pengambilan. Untuk memastikan keunikan, setiap tabel harus memiliki kolom (atau sekumpulan kolom), yang disebut primary key, yang secara unik mengidentifikasi setiap record tabel. Misalnya, nomor unik INSERT INTO tableName VALUES (row1FirstColumnValue, ..., row1lastColumnValue), (row2FirstColumnValue, ..., row2lastColumnValue), ..._60 dapat digunakan sebagai kunci utama untuk tabel INSERT INTO tableName VALUES (row1FirstColumnValue, ..., row1lastColumnValue), (row2FirstColumnValue, ..., row2lastColumnValue), ...61; . Kunci utama disebut kunci sederhana jika itu adalah satu kolom; . Sebagian besar RDBMS membuat indeks pada kunci utama untuk memfasilitasi pencarian cepat. Kunci utama sering digunakan untuk berhubungan dengan tabel lain Kunci asingKunci asing dari tabel anak digunakan untuk mereferensikan tabel induk. Batasan kunci asing dapat dikenakan untuk memastikan apa yang disebut integritas referensial - nilai dalam tabel anak harus merupakan nilai yang valid dalam tabel induk Kami mendefinisikan kunci asing saat mendefinisikan tabel anak, yang mereferensikan tabel induk, sebagai berikut Anda dapat menentukan tindakan referensi untuk mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */41 dan mysql> SELECT * FROM products WHERE quantity >= 5000 AND name LIKE 'Pen %'; +-----------+-------------+----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+----------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | | 1002 | PEN | Pen Blue | 8000 | 1.25 | +-----------+-------------+----------+----------+-------+ mysql> SELECT * FROM products WHERE quantity >= 5000 AND price < 1.24 AND name LIKE 'Pen %'; +-----------+-------------+---------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+---------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | +-----------+-------------+---------+----------+-------+ mysql> SELECT * FROM products WHERE NOT (quantity >= 5000 AND name LIKE 'Pen %'); +-----------+-------------+-----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+-----------+----------+-------+ | 1003 | PEN | Pen Black | 2000 | 1.25 | | 1004 | PEC | Pencil 2B | 10000 | 0.48 | | 1005 | PEC | Pencil 2H | 8000 | 0.49 | +-----------+-------------+-----------+----------+-------+8 melalui klausa INSERT INTO tableName VALUES (row1FirstColumnValue, ..., row1lastColumnValue), (row2FirstColumnValue, ..., row2lastColumnValue), ...68 dan INSERT INTO tableName VALUES (row1FirstColumnValue, ..., row1lastColumnValue), (row2FirstColumnValue, ..., row2lastColumnValue), ...69 opsional
Coba hapus catatan di tabel mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */85 (induk) yang direferensikan oleh INSERT INTO tableName VALUES (row1FirstColumnValue, ..., row1lastColumnValue), (row2FirstColumnValue, ..., row2lastColumnValue), ...31 tabel (anak), e. g. , Rekaman tidak dapat dihapus karena batasan "________99______85" default diberlakukan Indeks (atau Kunci)Indeks (atau Kunci) dapat dibuat pada kolom yang dipilih untuk memfasilitasi pencarian cepat. Tanpa indeks, " INSERT INTO tableName VALUES (row1FirstColumnValue, ..., row1lastColumnValue), (row2FirstColumnValue, ..., row2lastColumnValue), ...86" harus cocok dengan kolom SELECT .. FROM tableName WHERE criteria ORDER BY columnA ASC|DESC, columnB ASC|DESC, ...3 dari semua catatan di tabel mysql> SELECT * FROM products WHERE quantity >= 5000 AND name LIKE 'Pen %'; +-----------+-------------+----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+----------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | | 1002 | PEN | Pen Blue | 8000 | 1.25 | +-----------+-------------+----------+----------+-------+ mysql> SELECT * FROM products WHERE quantity >= 5000 AND price < 1.24 AND name LIKE 'Pen %'; +-----------+-------------+---------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+---------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | +-----------+-------------+---------+----------+-------+ mysql> SELECT * FROM products WHERE NOT (quantity >= 5000 AND name LIKE 'Pen %'); +-----------+-------------+-----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+-----------+----------+-------+ | 1003 | PEN | Pen Black | 2000 | 1.25 | | 1004 | PEC | Pencil 2B | 10000 | 0.48 | | 1005 | PEC | Pencil 2H | 8000 | 0.49 | +-----------+-------------+-----------+----------+-------+2. Jika SELECT .. FROM tableName WHERE criteria ORDER BY columnA ASC|DESC, columnB ASC|DESC, ..._3 kolom diindeks (mis. g. , menggunakan pohon biner), pencocokan dapat sangat ditingkatkan (melalui pencarian pohon biner) Anda harus mengindeks kolom yang sering digunakan dalam klausa ________22______35; Kelemahan tentang pengindeksan adalah biaya dan ruang. Membangun dan memelihara indeks membutuhkan komputasi dan ruang memori. Indeks memfasilitasi pencarian cepat tetapi menghabiskan kinerja dalam memodifikasi tabel ( INSERT INTO tableName VALUES (row1FirstColumnValue, ..., row1lastColumnValue), (row2FirstColumnValue, ..., row2lastColumnValue), ...92), dan perlu dibenarkan. Namun demikian, database relasional biasanya dioptimalkan untuk kueri dan pengambilan, tetapi BUKAN untuk pembaruan Di MySQL, kata kunci INSERT INTO tableName VALUES (row1FirstColumnValue, ..., row1lastColumnValue), (row2FirstColumnValue, ..., row2lastColumnValue), ..._93 adalah sinonim untuk INSERT INTO tableName VALUES (row1FirstColumnValue, ..., row1lastColumnValue), (row2FirstColumnValue, ..., row2lastColumnValue), ...94 Di MySQL, indeks dapat dibangun
Bisa ada lebih dari satu indeks dalam sebuah tabel. Indeks secara otomatis dibuat di kolom kunci utama Anda dapat membangun indeks melalui mysql> CREATE DATABASE southwind; Query OK, 1 row affected (0.03 sec) mysql> DROP DATABASE southwind; Query OK, 0 rows affected (0.11 sec) mysql> CREATE DATABASE IF NOT EXISTS southwind; Query OK, 1 row affected (0.01 sec) mysql> DROP DATABASE IF EXISTS southwind; Query OK, 0 rows affected (0.00 sec)33, mysql> SELECT name, price FROM products WHERE price < 1.0; +-----------+-------+ | name | price | +-----------+-------+ | Pencil 2B | 0.48 | | Pencil 2H | 0.49 | +-----------+-------+ 2 rows in set (0.00 sec) mysql> SELECT name, quantity FROM products WHERE quantity <= 2000; +-----------+----------+ | name | quantity | +-----------+----------+ | Pen Black | 2000 | +-----------+----------+ 1 row in set (0.00 sec)00 atau INSERT INTO tableName VALUES (row1FirstColumnValue, ..., row1lastColumnValue), (row2FirstColumnValue, ..., row2lastColumnValue), ...03 Lebih SQLSub-PermintaanHasil dari satu kueri dapat digunakan dalam pernyataan SQL lainnya. Subquery berguna jika lebih dari satu tabel yang terlibat PILIH dengan SubqueryPada contoh penjualan produk many-to-many sebelumnya, bagaimana menemukan pemasok yang tidak memasok produk apapun? mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */_6Bisakah Anda melakukan ini tanpa sub-permintaan? Subquery dapat mengembalikan skalar, satu kolom, satu baris, atau tabel. Anda dapat menggunakan operator perbandingan (mis. g. , mysql> CREATE DATABASE southwind; Query OK, 1 row affected (0.03 sec) mysql> DROP DATABASE southwind; Query OK, 0 rows affected (0.11 sec) mysql> CREATE DATABASE IF NOT EXISTS southwind; Query OK, 1 row affected (0.01 sec) mysql> DROP DATABASE IF EXISTS southwind; Query OK, 0 rows affected (0.00 sec)_50, mysql> CREATE DATABASE southwind; Query OK, 1 row affected (0.03 sec) mysql> DROP DATABASE southwind; Query OK, 0 rows affected (0.11 sec) mysql> CREATE DATABASE IF NOT EXISTS southwind; Query OK, 1 row affected (0.01 sec) mysql> DROP DATABASE IF EXISTS southwind; Query OK, 0 rows affected (0.00 sec)53) pada skalar, mysql> CREATE DATABASE southwind; Query OK, 1 row affected (0.03 sec) mysql> DROP DATABASE southwind; Query OK, 0 rows affected (0.11 sec) mysql> CREATE DATABASE IF NOT EXISTS southwind; Query OK, 1 row affected (0.01 sec) mysql> DROP DATABASE IF EXISTS southwind; Query OK, 0 rows affected (0.00 sec)91 atau mysql> CREATE DATABASE southwind; Query OK, 1 row affected (0.03 sec) mysql> DROP DATABASE southwind; Query OK, 0 rows affected (0.11 sec) mysql> CREATE DATABASE IF NOT EXISTS southwind; Query OK, 1 row affected (0.01 sec) mysql> DROP DATABASE IF EXISTS southwind; Query OK, 0 rows affected (0.00 sec)92 untuk baris atau kolom tunggal, mysql> SELECT name, price FROM products WHERE price < 1.0; +-----------+-------+ | name | price | +-----------+-------+ | Pencil 2B | 0.48 | | Pencil 2H | 0.49 | +-----------+-------+ 2 rows in set (0.00 sec) mysql> SELECT name, quantity FROM products WHERE quantity <= 2000; +-----------+----------+ | name | quantity | +-----------+----------+ | Pen Black | 2000 | +-----------+----------+ 1 row in set (0.00 sec)08 atau mysql> SELECT name, price FROM products WHERE price < 1.0; +-----------+-------+ | name | price | +-----------+-------+ | Pencil 2B | 0.48 | | Pencil 2H | 0.49 | +-----------+-------+ 2 rows in set (0.00 sec) mysql> SELECT name, quantity FROM products WHERE quantity <= 2000; +-----------+----------+ | name | quantity | +-----------+----------+ | Pen Black | 2000 | +-----------+----------+ 1 row in set (0.00 sec)09 untuk menguji himpunan kosong MENYISIPKAN. MEMPERBARUI. HAPUS dengan SubqueryAnda juga dapat menggunakan subquery dengan pernyataan SQL lainnya seperti mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */53, mysql> SELECT * FROM products WHERE quantity >= 5000 AND name LIKE 'Pen %'; +-----------+-------------+----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+----------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | | 1002 | PEN | Pen Blue | 8000 | 1.25 | +-----------+-------------+----------+----------+-------+ mysql> SELECT * FROM products WHERE quantity >= 5000 AND price < 1.24 AND name LIKE 'Pen %'; +-----------+-------------+---------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+---------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | +-----------+-------------+---------+----------+-------+ mysql> SELECT * FROM products WHERE NOT (quantity >= 5000 AND name LIKE 'Pen %'); +-----------+-------------+-----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+-----------+----------+-------+ | 1003 | PEN | Pen Black | 2000 | 1.25 | | 1004 | PEC | Pencil 2B | 10000 | 0.48 | | 1005 | PEC | Pencil 2H | 8000 | 0.49 | +-----------+-------------+-----------+----------+-------+8, atau mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */41. Sebagai contoh,Bekerja dengan Tanggal dan WaktuTanggal dan waktu sangat menarik untuk aplikasi basis data. Ini karena catatan bisnis sering memuat informasi tanggal/waktu (mis. g. , mysql> SELECT name, price FROM products WHERE price < 1.0; +-----------+-------+ | name | price | +-----------+-------+ | Pencil 2B | 0.48 | | Pencil 2H | 0.49 | +-----------+-------+ 2 rows in set (0.00 sec) mysql> SELECT name, quantity FROM products WHERE quantity <= 2000; +-----------+----------+ | name | quantity | +-----------+----------+ | Pen Black | 2000 | +-----------+----------+ 1 row in set (0.00 sec)_13, mysql> SELECT name, price FROM products WHERE price < 1.0; +-----------+-------+ | name | price | +-----------+-------+ | Pencil 2B | 0.48 | | Pencil 2H | 0.49 | +-----------+-------+ 2 rows in set (0.00 sec) mysql> SELECT name, quantity FROM products WHERE quantity <= 2000; +-----------+----------+ | name | quantity | +-----------+----------+ | Pen Black | 2000 | +-----------+----------+ 1 row in set (0.00 sec)14, mysql> SELECT name, price FROM products WHERE price < 1.0; +-----------+-------+ | name | price | +-----------+-------+ | Pencil 2B | 0.48 | | Pencil 2H | 0.49 | +-----------+-------+ 2 rows in set (0.00 sec) mysql> SELECT name, quantity FROM products WHERE quantity <= 2000; +-----------+----------+ | name | quantity | +-----------+----------+ | Pen Black | 2000 | +-----------+----------+ 1 row in set (0.00 sec)15, mysql> SELECT name, price FROM products WHERE price < 1.0; +-----------+-------+ | name | price | +-----------+-------+ | Pencil 2B | 0.48 | | Pencil 2H | 0.49 | +-----------+-------+ 2 rows in set (0.00 sec) mysql> SELECT name, quantity FROM products WHERE quantity <= 2000; +-----------+----------+ | name | quantity | +-----------+----------+ | Pen Black | 2000 | +-----------+----------+ 1 row in set (0.00 sec)16), serta kebutuhan untuk menandai waktu pembuatan dan pembaruan terakhir catatan untuk audit dan keamanan Dengan tipe data tanggal/waktu, Anda dapat mengurutkan hasil berdasarkan tanggal, mencari tanggal tertentu atau rentang tanggal, menghitung selisih antara tanggal, menghitung tanggal baru dengan menambahkan/mengurangi interval dari tanggal tertentu Tanggal Dengan ContohMari kita mulai dengan Tanggal (tanpa Waktu) dengan contoh berikut. Perhatikan bahwa nilai tanggal harus ditulis sebagai string dalam format mysql> SELECT name, price FROM products WHERE price < 1.0; +-----------+-------+ | name | price | +-----------+-------+ | Pencil 2B | 0.48 | | Pencil 2H | 0.49 | +-----------+-------+ 2 rows in set (0.00 sec) mysql> SELECT name, quantity FROM products WHERE quantity <= 2000; +-----------+----------+ | name | quantity | +-----------+----------+ | Pen Black | 2000 | +-----------+----------+ 1 row in set (0.00 sec)17, e. g. , mysql> SELECT name, price FROM products WHERE price < 1.0; +-----------+-------+ | name | price | +-----------+-------+ | Pencil 2B | 0.48 | | Pencil 2H | 0.49 | +-----------+-------+ 2 rows in set (0.00 sec) mysql> SELECT name, quantity FROM products WHERE quantity <= 2000; +-----------+----------+ | name | quantity | +-----------+----------+ | Pen Black | 2000 | +-----------+----------+ 1 row in set (0.00 sec)_18 Fungsi Tanggal/WaktuMySQL menyediakan fungsi bawaan ini untuk mendapatkan tanggal, waktu, dan waktu saat ini
Sebagai contoh, mysql> CREATE DATABASE IF NOT EXISTS southwind;
mysql> SHOW CREATE DATABASE southwind \G
*************************** 1. row ***************************
Database: southwind
Create Database: CREATE DATABASE `southwind` /*!40100 DEFAULT CHARACTER SET latin1 */_7Jenis Tanggal/Waktu SQLMySQL menyediakan tipe data tanggal/waktu ini
Nilai tanggal/waktu dapat dimasukkan secara manual sebagai string literal (mis. g. , mysql> SELECT name, price FROM products WHERE price < 1.0; +-----------+-------+ | name | price | +-----------+-------+ | Pencil 2B | 0.48 | | Pencil 2H | 0.49 | +-----------+-------+ 2 rows in set (0.00 sec) mysql> SELECT name, quantity FROM products WHERE quantity <= 2000; +-----------+----------+ | name | quantity | +-----------+----------+ | Pen Black | 2000 | +-----------+----------+ 1 row in set (0.00 sec)_64 untuk mysql> SELECT name, price FROM products WHERE price < 1.0; +-----------+-------+ | name | price | +-----------+-------+ | Pencil 2B | 0.48 | | Pencil 2H | 0.49 | +-----------+-------+ 2 rows in set (0.00 sec) mysql> SELECT name, quantity FROM products WHERE quantity <= 2000; +-----------+----------+ | name | quantity | +-----------+----------+ | Pen Black | 2000 | +-----------+----------+ 1 row in set (0.00 sec)65). MySQL akan mengeluarkan peringatan dan memasukkan semua nol (mis. g. , mysql> SELECT name, price FROM products WHERE price < 1.0; +-----------+-------+ | name | price | +-----------+-------+ | Pencil 2B | 0.48 | | Pencil 2H | 0.49 | +-----------+-------+ 2 rows in set (0.00 sec) mysql> SELECT name, quantity FROM products WHERE quantity <= 2000; +-----------+----------+ | name | quantity | +-----------+----------+ | Pen Black | 2000 | +-----------+----------+ 1 row in set (0.00 sec)_66 untuk mysql> SELECT name, price FROM products WHERE price < 1.0; +-----------+-------+ | name | price | +-----------+-------+ | Pencil 2B | 0.48 | | Pencil 2H | 0.49 | +-----------+-------+ 2 rows in set (0.00 sec) mysql> SELECT name, quantity FROM products WHERE quantity <= 2000; +-----------+----------+ | name | quantity | +-----------+----------+ | Pen Black | 2000 | +-----------+----------+ 1 row in set (0.00 sec)65), jika nilai tanggal/waktu yang akan dimasukkan tidak valid atau di luar rentang. mysql> SELECT name, price FROM products WHERE price < 1.0; +-----------+-------+ | name | price | +-----------+-------+ | Pencil 2B | 0.48 | | Pencil 2H | 0.49 | +-----------+-------+ 2 rows in set (0.00 sec) mysql> SELECT name, quantity FROM products WHERE quantity <= 2000; +-----------+----------+ | name | quantity | +-----------+----------+ | Pen Black | 2000 | +-----------+----------+ 1 row in set (0.00 sec)_68 disebut tanggal "tiruan". Lebih Banyak Fungsi Tanggal/WaktuReferensi. "Fungsi Tanggal dan Waktu" MySQL @ http. //dev. mysql. com/doc/refman/5. 5/id/fungsi-tanggal-dan-waktu. html Ada banyak fungsi tanggal/waktu
MelihatTampilan adalah tabel virtual yang tidak berisi data fisik. Ini memberikan cara alternatif untuk melihat data INSERT INTO tableName VALUES (row1FirstColumnValue, ..., row1lastColumnValue), (row2FirstColumnValue, ..., row2lastColumnValue), ..._9 TransaksiTransaksi atomik adalah sekumpulan pernyataan SQL yang SEMUA berhasil atau SEMUA gagal. Transaksi penting untuk memastikan bahwa tidak ada pembaruan sebagian ke database, mengingat atom pernyataan SQL. Transaksi dilakukan melalui mysql> SELECT * FROM products WHERE quantity >= 5000 AND name LIKE 'Pen %'; +-----------+-------------+----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+----------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | | 1002 | PEN | Pen Blue | 8000 | 1.25 | +-----------+-------------+----------+----------+-------+ mysql> SELECT * FROM products WHERE quantity >= 5000 AND price < 1.24 AND name LIKE 'Pen %'; +-----------+-------------+---------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+---------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | +-----------+-------------+---------+----------+-------+ mysql> SELECT * FROM products WHERE NOT (quantity >= 5000 AND name LIKE 'Pen %'); +-----------+-------------+-----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+-----------+----------+-------+ | 1003 | PEN | Pen Black | 2000 | 1.25 | | 1004 | PEC | Pencil 2B | 10000 | 0.48 | | 1005 | PEC | Pencil 2H | 8000 | 0.49 | +-----------+-------------+-----------+----------+-------+01 dan mysql> SELECT * FROM products WHERE quantity >= 5000 AND name LIKE 'Pen %'; +-----------+-------------+----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+----------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | | 1002 | PEN | Pen Blue | 8000 | 1.25 | +-----------+-------------+----------+----------+-------+ mysql> SELECT * FROM products WHERE quantity >= 5000 AND price < 1.24 AND name LIKE 'Pen %'; +-----------+-------------+---------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+---------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | +-----------+-------------+---------+----------+-------+ mysql> SELECT * FROM products WHERE NOT (quantity >= 5000 AND name LIKE 'Pen %'); +-----------+-------------+-----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+-----------+----------+-------+ | 1003 | PEN | Pen Black | 2000 | 1.25 | | 1004 | PEC | Pencil 2B | 10000 | 0.48 | | 1005 | PEC | Pencil 2H | 8000 | 0.49 | +-----------+-------------+-----------+----------+-------+02 Jika Anda memulai klien mysql> SELECT name, price FROM products WHERE price < 1.0; +-----------+-------+ | name | price | +-----------+-------+ | Pencil 2B | 0.48 | | Pencil 2H | 0.49 | +-----------+-------+ 2 rows in set (0.00 sec) mysql> SELECT name, quantity FROM products WHERE quantity <= 2000; +-----------+----------+ | name | quantity | +-----------+----------+ | Pen Black | 2000 | +-----------+----------+ 1 row in set (0.00 sec)_7 lainnya dan melakukan mysql> CREATE DATABASE southwind; Query OK, 1 row affected (0.03 sec) mysql> DROP DATABASE southwind; Query OK, 0 rows affected (0.11 sec) mysql> CREATE DATABASE IF NOT EXISTS southwind; Query OK, 1 row affected (0.01 sec) mysql> DROP DATABASE IF EXISTS southwind; Query OK, 0 rows affected (0.00 sec)43 selama transaksi (sebelum komit atau rollback), Anda tidak akan melihat perubahannya Sebagai alternatif, Anda juga dapat menonaktifkan apa yang disebut mode mysql> SELECT * FROM products WHERE quantity >= 5000 AND name LIKE 'Pen %'; +-----------+-------------+----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+----------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | | 1002 | PEN | Pen Blue | 8000 | 1.25 | +-----------+-------------+----------+----------+-------+ mysql> SELECT * FROM products WHERE quantity >= 5000 AND price < 1.24 AND name LIKE 'Pen %'; +-----------+-------------+---------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+---------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | +-----------+-------------+---------+----------+-------+ mysql> SELECT * FROM products WHERE NOT (quantity >= 5000 AND name LIKE 'Pen %'); +-----------+-------------+-----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+-----------+----------+-------+ | 1003 | PEN | Pen Black | 2000 | 1.25 | | 1004 | PEC | Pencil 2B | 10000 | 0.48 | | 1005 | PEC | Pencil 2H | 8000 | 0.49 | +-----------+-------------+-----------+----------+-------+05, yang diatur secara default dan melakukan setiap pernyataan SQL tunggal Transaksi mengelompokkan serangkaian operasi ke dalam unit yang memenuhi uji ACID
Variabel PenggunaDi MySQL, Anda dapat menentukan variabel pengguna melalui
Sebagai contoh, mysql> SELECT name, price FROM products WHERE price < 1.0; +-----------+-------+ | name | price | +-----------+-------+ | Pencil 2B | 0.48 | | Pencil 2H | 0.49 | +-----------+-------+ 2 rows in set (0.00 sec) mysql> SELECT name, quantity FROM products WHERE quantity <= 2000; +-----------+----------+ | name | quantity | +-----------+----------+ | Pen Black | 2000 | +-----------+----------+ 1 row in set (0.00 sec)_0 Lebih lanjut tentang BERGABUNGGABUNG DALAMDalam gabungan dua tabel, setiap baris dari tabel pertama digabungkan (digabung) dengan setiap baris dari tabel kedua. Misalkan ada n1 baris di tabel pertama dan n2 baris di tabel kedua, mysql> SELECT * FROM products WHERE quantity >= 5000 AND name LIKE 'Pen %'; +-----------+-------------+----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+----------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | | 1002 | PEN | Pen Blue | 8000 | 1.25 | +-----------+-------------+----------+----------+-------+ mysql> SELECT * FROM products WHERE quantity >= 5000 AND price < 1.24 AND name LIKE 'Pen %'; +-----------+-------------+---------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+---------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | +-----------+-------------+---------+----------+-------+ mysql> SELECT * FROM products WHERE NOT (quantity >= 5000 AND name LIKE 'Pen %'); +-----------+-------------+-----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+-----------+----------+-------+ | 1003 | PEN | Pen Black | 2000 | 1.25 | | 1004 | PEC | Pencil 2B | 10000 | 0.48 | | 1005 | PEC | Pencil 2H | 8000 | 0.49 | +-----------+-------------+-----------+----------+-------+10 menghasilkan semua kombinasi dari n1×n2 baris - ini dikenal sebagai Produk Cartesian atau Perkalian Silang Anda dapat memaksakan batasan dengan menggunakan klausa mysql> SELECT * FROM products WHERE quantity >= 5000 AND name LIKE 'Pen %'; +-----------+-------------+----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+----------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | | 1002 | PEN | Pen Blue | 8000 | 1.25 | +-----------+-------------+----------+----------+-------+ mysql> SELECT * FROM products WHERE quantity >= 5000 AND price < 1.24 AND name LIKE 'Pen %'; +-----------+-------------+---------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+---------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | +-----------+-------------+---------+----------+-------+ mysql> SELECT * FROM products WHERE NOT (quantity >= 5000 AND name LIKE 'Pen %'); +-----------+-------------+-----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+-----------+----------+-------+ | 1003 | PEN | Pen Black | 2000 | 1.25 | | 1004 | PEC | Pencil 2B | 10000 | 0.48 | | 1005 | PEC | Pencil 2H | 8000 | 0.49 | +-----------+-------------+-----------+----------+-------+11, misalnya, mysql> SELECT name, price FROM products WHERE price < 1.0; +-----------+-------+ | name | price | +-----------+-------+ | Pencil 2B | 0.48 | | Pencil 2H | 0.49 | +-----------+-------+ 2 rows in set (0.00 sec) mysql> SELECT name, quantity FROM products WHERE quantity <= 2000; +-----------+----------+ | name | quantity | +-----------+----------+ | Pen Black | 2000 | +-----------+----------+ 1 row in set (0.00 sec)_1 Perhatikan bahwa yang berikut ini setara GABUNG LUAR - GABUNG KIRI dan GABUNG KANANmysql> SELECT * FROM products WHERE quantity >= 5000 AND name LIKE 'Pen %'; +-----------+-------------+----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+----------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | | 1002 | PEN | Pen Blue | 8000 | 1.25 | +-----------+-------------+----------+----------+-------+ mysql> SELECT * FROM products WHERE quantity >= 5000 AND price < 1.24 AND name LIKE 'Pen %'; +-----------+-------------+---------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+---------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | +-----------+-------------+---------+----------+-------+ mysql> SELECT * FROM products WHERE NOT (quantity >= 5000 AND name LIKE 'Pen %'); +-----------+-------------+-----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+-----------+----------+-------+ | 1003 | PEN | Pen Black | 2000 | 1.25 | | 1004 | PEC | Pencil 2B | 10000 | 0.48 | | 1005 | PEC | Pencil 2H | 8000 | 0.49 | +-----------+-------------+-----------+----------+-------+_10 dengan batasan ( mysql> SELECT * FROM products WHERE quantity >= 5000 AND name LIKE 'Pen %'; +-----------+-------------+----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+----------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | | 1002 | PEN | Pen Blue | 8000 | 1.25 | +-----------+-------------+----------+----------+-------+ mysql> SELECT * FROM products WHERE quantity >= 5000 AND price < 1.24 AND name LIKE 'Pen %'; +-----------+-------------+---------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+---------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | +-----------+-------------+---------+----------+-------+ mysql> SELECT * FROM products WHERE NOT (quantity >= 5000 AND name LIKE 'Pen %'); +-----------+-------------+-----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+-----------+----------+-------+ | 1003 | PEN | Pen Black | 2000 | 1.25 | | 1004 | PEC | Pencil 2B | 10000 | 0.48 | | 1005 | PEC | Pencil 2H | 8000 | 0.49 | +-----------+-------------+-----------+----------+-------+11 atau mysql> SELECT * FROM products WHERE quantity >= 5000 AND name LIKE 'Pen %'; +-----------+-------------+----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+----------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | | 1002 | PEN | Pen Blue | 8000 | 1.25 | +-----------+-------------+----------+----------+-------+ mysql> SELECT * FROM products WHERE quantity >= 5000 AND price < 1.24 AND name LIKE 'Pen %'; +-----------+-------------+---------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+---------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | +-----------+-------------+---------+----------+-------+ mysql> SELECT * FROM products WHERE NOT (quantity >= 5000 AND name LIKE 'Pen %'); +-----------+-------------+-----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+-----------+----------+-------+ | 1003 | PEN | Pen Black | 2000 | 1.25 | | 1004 | PEC | Pencil 2B | 10000 | 0.48 | | 1005 | PEC | Pencil 2H | 8000 | 0.49 | +-----------+-------------+-----------+----------+-------+14) menghasilkan baris yang ditemukan di kedua tabel. Di sisi lain, mysql> SELECT * FROM products WHERE quantity >= 5000 AND name LIKE 'Pen %'; +-----------+-------------+----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+----------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | | 1002 | PEN | Pen Blue | 8000 | 1.25 | +-----------+-------------+----------+----------+-------+ mysql> SELECT * FROM products WHERE quantity >= 5000 AND price < 1.24 AND name LIKE 'Pen %'; +-----------+-------------+---------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+---------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | +-----------+-------------+---------+----------+-------+ mysql> SELECT * FROM products WHERE NOT (quantity >= 5000 AND name LIKE 'Pen %'); +-----------+-------------+-----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+-----------+----------+-------+ | 1003 | PEN | Pen Black | 2000 | 1.25 | | 1004 | PEC | Pencil 2B | 10000 | 0.48 | | 1005 | PEC | Pencil 2H | 8000 | 0.49 | +-----------+-------------+-----------+----------+-------+_15 dapat menghasilkan baris yang ada di satu tabel, tetapi tidak di tabel lain. Ada dua jenis mysql> SELECT * FROM products WHERE quantity >= 5000 AND name LIKE 'Pen %'; +-----------+-------------+----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+----------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | | 1002 | PEN | Pen Blue | 8000 | 1.25 | +-----------+-------------+----------+----------+-------+ mysql> SELECT * FROM products WHERE quantity >= 5000 AND price < 1.24 AND name LIKE 'Pen %'; +-----------+-------------+---------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+---------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | +-----------+-------------+---------+----------+-------+ mysql> SELECT * FROM products WHERE NOT (quantity >= 5000 AND name LIKE 'Pen %'); +-----------+-------------+-----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+-----------+----------+-------+ | 1003 | PEN | Pen Black | 2000 | 1.25 | | 1004 | PEC | Pencil 2B | 10000 | 0.48 | | 1005 | PEC | Pencil 2H | 8000 | 0.49 | +-----------+-------------+-----------+----------+-------+15s. mysql> SELECT * FROM products WHERE quantity >= 5000 AND name LIKE 'Pen %'; +-----------+-------------+----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+----------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | | 1002 | PEN | Pen Blue | 8000 | 1.25 | +-----------+-------------+----------+----------+-------+ mysql> SELECT * FROM products WHERE quantity >= 5000 AND price < 1.24 AND name LIKE 'Pen %'; +-----------+-------------+---------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+---------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | +-----------+-------------+---------+----------+-------+ mysql> SELECT * FROM products WHERE NOT (quantity >= 5000 AND name LIKE 'Pen %'); +-----------+-------------+-----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+-----------+----------+-------+ | 1003 | PEN | Pen Black | 2000 | 1.25 | | 1004 | PEC | Pencil 2B | 10000 | 0.48 | | 1005 | PEC | Pencil 2H | 8000 | 0.49 | +-----------+-------------+-----------+----------+-------+_17 menghasilkan baris yang ada di tabel kiri, tetapi mungkin tidak di tabel kanan; Dalam mysql> SELECT * FROM products WHERE quantity >= 5000 AND name LIKE 'Pen %'; +-----------+-------------+----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+----------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | | 1002 | PEN | Pen Blue | 8000 | 1.25 | +-----------+-------------+----------+----------+-------+ mysql> SELECT * FROM products WHERE quantity >= 5000 AND price < 1.24 AND name LIKE 'Pen %'; +-----------+-------------+---------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+---------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | +-----------+-------------+---------+----------+-------+ mysql> SELECT * FROM products WHERE NOT (quantity >= 5000 AND name LIKE 'Pen %'); +-----------+-------------+-----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+-----------+----------+-------+ | 1003 | PEN | Pen Black | 2000 | 1.25 | | 1004 | PEC | Pencil 2B | 10000 | 0.48 | | 1005 | PEC | Pencil 2H | 8000 | 0.49 | +-----------+-------------+-----------+----------+-------+_17, ketika baris di tabel kiri tidak cocok dengan tabel kanan, itu tetap dipilih tetapi dengan menggabungkan dengan catatan "palsu" dari semua mysql> CREATE DATABASE southwind; Query OK, 1 row affected (0.03 sec) mysql> DROP DATABASE southwind; Query OK, 0 rows affected (0.11 sec) mysql> CREATE DATABASE IF NOT EXISTS southwind; Query OK, 1 row affected (0.01 sec) mysql> DROP DATABASE IF EXISTS southwind; Query OK, 0 rows affected (0.00 sec)18s untuk tabel kanan mysql> SELECT name, price FROM products WHERE price < 1.0; +-----------+-------+ | name | price | +-----------+-------+ | Pencil 2B | 0.48 | | Pencil 2H | 0.49 | +-----------+-------+ 2 rows in set (0.00 sec) mysql> SELECT name, quantity FROM products WHERE quantity <= 2000; +-----------+----------+ | name | quantity | +-----------+----------+ | Pen Black | 2000 | +-----------+----------+ 1 row in set (0.00 sec)_2 Sebagai hasilnya, mysql> SELECT * FROM products WHERE quantity >= 5000 AND name LIKE 'Pen %'; +-----------+-------------+----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+----------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | | 1002 | PEN | Pen Blue | 8000 | 1.25 | +-----------+-------------+----------+----------+-------+ mysql> SELECT * FROM products WHERE quantity >= 5000 AND price < 1.24 AND name LIKE 'Pen %'; +-----------+-------------+---------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+---------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | +-----------+-------------+---------+----------+-------+ mysql> SELECT * FROM products WHERE NOT (quantity >= 5000 AND name LIKE 'Pen %'); +-----------+-------------+-----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+-----------+----------+-------+ | 1003 | PEN | Pen Black | 2000 | 1.25 | | 1004 | PEC | Pencil 2B | 10000 | 0.48 | | 1005 | PEC | Pencil 2H | 8000 | 0.49 | +-----------+-------------+-----------+----------+-------+_17 memastikan bahwa set hasil berisi setiap baris di tabel kiri. Ini penting, karena dalam beberapa kueri, Anda tertarik untuk mendapatkan hasil di setiap baris di tabel kiri, tanpa kecocokan di tabel kanan, mis. g. , mencari barang tanpa pemasok. Sebagai contoh, mysql> SELECT name, price FROM products WHERE price < 1.0; +-----------+-------+ | name | price | +-----------+-------+ | Pencil 2B | 0.48 | | Pencil 2H | 0.49 | +-----------+-------+ 2 rows in set (0.00 sec) mysql> SELECT name, quantity FROM products WHERE quantity <= 2000; +-----------+----------+ | name | quantity | +-----------+----------+ | Pen Black | 2000 | +-----------+----------+ 1 row in set (0.00 sec)_3 Perhatikan bahwa berikut ini setara LatihanSistem PenyewaanPeter menjalankan perusahaan persewaan mobil kecil dengan 10 mobil dan 5 truk. Dia melibatkan Anda untuk merancang portal web agar operasinya online Untuk tahap awal, portal web harus menyediakan fungsi-fungsi dasar ini
Catatan pelanggan berisi nama, alamat, dan nomor teleponnya Kendaraan, yang diidentifikasi dengan nomor registrasi kendaraan, dapat disewa setiap hari. Tarif sewa berbeda untuk kendaraan yang berbeda. Ada diskon 20% untuk sewa 7 hari atau lebih Pelanggan dapat menyewa kendaraan dari tanggal mulai hingga tanggal akhir. Diskon pelanggan khusus, mulai dari 0-50%, dapat diberikan kepada pelanggan pilihan Basis dataDatabase awal berisi 3 tabel. mysql> SELECT * FROM products WHERE quantity >= 5000 AND name LIKE 'Pen %'; +-----------+-------------+----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+----------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | | 1002 | PEN | Pen Blue | 8000 | 1.25 | +-----------+-------------+----------+----------+-------+ mysql> SELECT * FROM products WHERE quantity >= 5000 AND price < 1.24 AND name LIKE 'Pen %'; +-----------+-------------+---------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+---------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | +-----------+-------------+---------+----------+-------+ mysql> SELECT * FROM products WHERE NOT (quantity >= 5000 AND name LIKE 'Pen %'); +-----------+-------------+-----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+-----------+----------+-------+ | 1003 | PEN | Pen Black | 2000 | 1.25 | | 1004 | PEC | Pencil 2B | 10000 | 0.48 | | 1005 | PEC | Pencil 2H | 8000 | 0.49 | +-----------+-------------+-----------+----------+-------+_22, INSERT INTO tableName VALUES (row1FirstColumnValue, ..., row1lastColumnValue), (row2FirstColumnValue, ..., row2lastColumnValue), ...61, dan mysql> SELECT * FROM products WHERE quantity >= 5000 AND name LIKE 'Pen %'; +-----------+-------------+----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+----------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | | 1002 | PEN | Pen Blue | 8000 | 1.25 | +-----------+-------------+----------+----------+-------+ mysql> SELECT * FROM products WHERE quantity >= 5000 AND price < 1.24 AND name LIKE 'Pen %'; +-----------+-------------+---------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+---------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | +-----------+-------------+---------+----------+-------+ mysql> SELECT * FROM products WHERE NOT (quantity >= 5000 AND name LIKE 'Pen %'); +-----------+-------------+-----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+-----------+----------+-------+ | 1003 | PEN | Pen Black | 2000 | 1.25 | | 1004 | PEC | Pencil 2B | 10000 | 0.48 | | 1005 | PEC | Pencil 2H | 8000 | 0.49 | +-----------+-------------+-----------+----------+-------+24. mysql> SELECT * FROM products WHERE quantity >= 5000 AND name LIKE 'Pen %'; +-----------+-------------+----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+----------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | | 1002 | PEN | Pen Blue | 8000 | 1.25 | +-----------+-------------+----------+----------+-------+ mysql> SELECT * FROM products WHERE quantity >= 5000 AND price < 1.24 AND name LIKE 'Pen %'; +-----------+-------------+---------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+---------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | +-----------+-------------+---------+----------+-------+ mysql> SELECT * FROM products WHERE NOT (quantity >= 5000 AND name LIKE 'Pen %'); +-----------+-------------+-----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+-----------+----------+-------+ | 1003 | PEN | Pen Black | 2000 | 1.25 | | 1004 | PEC | Pencil 2B | 10000 | 0.48 | | 1005 | PEC | Pencil 2H | 8000 | 0.49 | +-----------+-------------+-----------+----------+-------+24 adalah tabel persimpangan yang mendukung hubungan banyak-ke-banyak antara mysql> SELECT * FROM products WHERE quantity >= 5000 AND name LIKE 'Pen %'; +-----------+-------------+----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+----------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | | 1002 | PEN | Pen Blue | 8000 | 1.25 | +-----------+-------------+----------+----------+-------+ mysql> SELECT * FROM products WHERE quantity >= 5000 AND price < 1.24 AND name LIKE 'Pen %'; +-----------+-------------+---------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+---------+----------+-------+ | 1001 | PEN | Pen Red | 5000 | 1.23 | +-----------+-------------+---------+----------+-------+ mysql> SELECT * FROM products WHERE NOT (quantity >= 5000 AND name LIKE 'Pen %'); +-----------+-------------+-----------+----------+-------+ | productID | productCode | name | quantity | price | +-----------+-------------+-----------+----------+-------+ | 1003 | PEN | Pen Black | 2000 | 1.25 | | 1004 | PEC | Pencil 2B | 10000 | 0.48 | | 1005 | PEC | Pencil 2H | 8000 | 0.49 | +-----------+-------------+-----------+----------+-------+22 dan INSERT INTO tableName VALUES (row1FirstColumnValue, ..., row1lastColumnValue), (row2FirstColumnValue, ..., row2lastColumnValue), ...61 Bagaimana cara menjatuhkan kunci asing di MySQL?Menghilangkan Batasan Kunci Asing
. ALTER TABLE tbl_name DROP FOREIGN KEY fk_symbol; Jika klausa FOREIGN KEY menentukan nama CONSTRAINT saat Anda membuat batasan, Anda dapat merujuk ke nama tersebut untuk menghapus .
Bagaimana cara memeriksa apakah kunci asing ada di tabel MySQL?Untuk melihat hubungan kunci asing dari sebuah tabel. PILIH TABLE_NAME, COLUMN_NAME, CONSTRAINT_NAME, REFERENCED_TABLE_NAME, REFERENCED_COLUMN_NAME DARI INFORMATION_SCHEMA. KEY_COLUMN_USAGE WHERE REFERENCED_TABLE_SCHEMA = 'db_name' AND REFERENCED_TABLE_NAME = 'table_name';
Bagaimana cara menjatuhkan batasan dalam SQL jika ada?Perintah DROP CONSTRAINT digunakan untuk menghapus batasan UNIQUE, PRIMARY KEY, FOREIGN KEY, atau CHECK. . JATUHKAN Kendala UNIK. Untuk menghapus batasan UNIK, gunakan SQL berikut. . JATUHKAN Batasan KUNCI UTAMA. Untuk menghapus batasan PRIMARY KEY, gunakan SQL berikut. . JATUHKAN Batasan KUNCI ASING Bagaimana cara menghilangkan batasan kunci asing?Untuk menghapus batasan kunci asing . Di Object Explorer, perluas tabel dengan batasan lalu perluas Kunci Klik kanan pembatas lalu klik Hapus Di kotak dialog Hapus Objek, klik OK |
Jatuhkan kunci asing mysql jika ada
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