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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