修改MySQL数据库表结构的方法：
1、查看表结构
mysql> show create table student; +---------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ | Table | Create Table | +---------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ | student | CREATE TABLE `student` ( `ID` int(11) NOT NULL AUTO_INCREMENT, `NAME` varchar(20) NOT NULL, `AGE` int(11) NOT NULL, PRIMARY KEY (`ID`) ) ENGINE=InnoDB AUTO_INCREMENT=13 DEFAULT CHARSET=utf8 | +---------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ 1 row in set (0.09 sec)
2、添加列
mysql> alter table student add column birthday datetime; Query OK, 0 rows affected (2.06 sec) Records: 0 Duplicates: 0 Warnings: 0
3、删除列
mysql> alter table student drop column birthday; Query OK, 0 rows affected (0.80 sec) Records: 0 Duplicates: 0 Warnings: 0
4、修改列
--1.修改列的类型 mysql> alter table student modify age int not null; Query OK, 0 rows affected (0.09 sec) Records: 0 Duplicates: 0 Warnings: 0 --2.修改列的名称 mysql> alter table student change column name sname varchar(20); Query OK, 0 rows affected (1.31 sec) Records: 0 Duplicates: 0 Warnings: 0
