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:
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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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