MySQL -- 基础语句一览表

MySQL – 基础语句一览表

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表格一览

作用	语句
查看当前所有的数据库	SHOW DATABASES;
查看当前数据库中所有的表	SHOW TABLES;
查看当前表的结构	DESC table_name;
查看当前所有用户	SELECT User, Host FROM mysql.User;
选择指定数据库	USE database_name;
创建数据库	CREATE DATABASE database_name;
删除数据库	DROP DATABASE database_name;
查看支持的引擎	SHOW ENGINES \G 1

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建立表

CREATE [TEMPORARY] TABLE [IF NOT EXISTS] tbl_name
    (create_definition,...)
    [table_options]
    [partition_options]

CREATE [TEMPORARY] TABLE [IF NOT EXISTS] tbl_name
    [(create_definition,...)]
    [table_options]
    [partition_options]
    [IGNORE | REPLACE]
    [AS] query_expression

CREATE [TEMPORARY] TABLE [IF NOT EXISTS] tbl_name
    { LIKE old_tbl_name | (LIKE old_tbl_name) }

例子：2

mysql> CREATE TABLE stu_info(
    -> account INT NOT NULL PRIMARY KEY UNIQUE KEY,
    -> name varchar(20) NOT NULL);
Query OK, 0 rows affected (0.02 sec)

mysql> DESC stu_info;
+---------+-------------+------+-----+---------+-------+
| Field   | Type        | Null | Key | Default | Extra |
+---------+-------------+------+-----+---------+-------+
| account | int(11)     | NO   | PRI | NULL    |       |
| name    | varchar(20) | NO   |     | NULL    |       |
+---------+-------------+------+-----+---------+-------+
2 rows in set (0.01 sec)

删除表

DROP [TEMPORARY] TABLE [IF EXISTS]
    tbl_name [, tbl_name] ...
    [RESTRICT | CASCADE]

例子：

mysql> DROP TABLE stu_info;
Query OK, 0 rows affected (0.02 sec)

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1. ego (\G) Send command to mysql server, display result vertically. ↩
2. PRIMARY KEY ：主键 ； UNIQUE KEY： 唯一键约束 ↩