查看表结构的两种方式
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desc模式和show create table 具体模式
mysql> select * from tb_emp8; +----+------+--------+--------+ | id | name | deptid | salary | +----+------+--------+--------+ | 1 | ds | 2 | NULL | | 2 | fr | 7 | NULL | | 3 | ds | 99 | NULL | +----+------+--------+--------+ 3 rows in set (0.00 sec) mysql> desc tb_emp8; +--------+-------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +--------+-------------+------+-----+---------+----------------+ | id | int(11) | NO | PRI | NULL | auto_increment | | name | varchar(25) | NO | | NULL | | | deptid | int(11) | YES | | NULL | | | salary | float | YES | | NULL | | +--------+-------------+------+-----+---------+----------------+ 4 rows in set (0.00 sec) mysql> show create table tb_emp8; +---------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ | Table | Create Table | +---------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ | tb_emp8 | CREATE TABLE `tb_emp8` ( `id` int(11) NOT NULL AUTO_INCREMENT, `name` varchar(25) NOT NULL, `deptid` int(11) DEFAULT NULL, `salary` float DEFAULT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB AUTO_INCREMENT=4 DEFAULT CHARSET=latin1 | +---------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ 1 row in set (0.00 sec)
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