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)
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