mysql desc(DESCRIBE)命令实例讲解

mysql desc命令用于查看表结构，是DESCRIBE命令的简写形式。

mysql desc命令语法：

desc tablename

该命令会显示表哪些信息呢？具体包括：

字段名称(Field)

字段类型(Type)

字段是否为null

字段是否为主键(key)

字段的默认值(default)

Extra

实例：

mysql> CREATE TABLE employee ( -> ID INT(2) auto_increment primary key, -> First_name VARCHAR(20), -> Last_name VARCHAR(30), -> Start_date DATE, -> Salary int(6), -> city VARCHAR(20), -> description VARCHAR(20) -> ); Query OK, 0 rows affected (0.02 sec) mysql> mysql> desc employee; +-------------+-------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +-------------+-------------+------+-----+---------+----------------+ | ID | int(2) | NO | PRI | NULL | auto_increment | | First_name | varchar(20) | YES | | NULL | | | Last_name | varchar(30) | YES | | NULL | | | Start_date | date | YES | | NULL | | | Salary | int(6) | YES | | NULL | | | city | varchar(20) | YES | | NULL | | | description | varchar(20) | YES | | NULL | | +-------------+-------------+------+-----+---------+----------------+ 7 rows in set (0.00 sec)