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)
转播
