MySQL命令行删除表中的一个字段_MySQL
先看看删除之前的表结构:mysql> select * from test;+------+--------+----------------------------------+------------+------------+------------+------------+| t_id | t_name | t_password | t_birth | birth | birth1 | birth2 |+------+--------+----------------------------------+------------+------------+------------+------------+| 1 | name1 | 12345678901234567890123456789012 | NULL | 1990-01-01 | 0000-00-00 | 2013-01-01 || 2 | name2 | 12345678901234567890123456789012 | 2013-01-01 | NULL | 0000-00-00 | 2013-01-01 |+------+--------+----------------------------------+------------+------------+------------+------------+2 rows in set (0.00 sec) 执行删除命令,使用drop关键字。 <表名> drop column <字段名>; 具体的命令如下: mysql> alter table test drop column birth1;Query OK, 0 rows affected (0.13 sec)Records: 0 Duplicates: 0 Warnings: 0 看看删除后的结果,是不是已经没有birth1字段了? mysql> select * from test;+------+--------+----------------------------------+------------+------------+------------+| t_id | t_name | t_password | t_birth | birth | birth2 |+------+--------+----------------------------------+------------+------------+------------+| 1 | name1 | 12345678901234567890123456789012 | NULL | 1990-01-01 | 2013-01-01 || 2 | name2 | 12345678901234567890123456789012 | 2013-01-01 | NULL | 2013-01-01 |+------+--------+----------------------------------+------------+------------+------------+2 rows in set (0.00 sec) 以上就是MySQL命令行删除表中的一个字段_MySQL的内容, |