标签：+-------+-------------------+------+-----+---------+-------+ 删除 char 修改 student
1、修改表名
alter table student rename student_new;
2、修改字段名字
alter table student change sname new_name char(8);
3、修改字段的数据类型
alter table student modify sname char(10);
4、修改字段前后位置
mysql> desc student;
+-------+-------------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+-------+-------------------+------+-----+---------+-------+
| sage | tinyint(4) | YES | | NULL | |
| sno | char(5) | NO | PRI | NULL | |
| sname | char(10) | YES | | NULL | |
| ssex | enum('女','男') | YES | | 男 | |
| sdept | varchar(20) | YES | | NULL | |
+-------+-------------------+------+-----+---------+-------+
mysql> alter table student modify sage tinyint(4) after sno;
# after 或 first
mysql> desc student;
+-------+-------------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+-------+-------------------+------+-----+---------+-------+
| sno | char(5) | NO | PRI | NULL | |
| sage | tinyint(4) | YES | | NULL | |
| sname | char(10) | YES | | NULL | |
| ssex | enum('女','男') | YES | | 男 | |
| sdept | varchar(20) | YES | | NULL | |
+-------+-------------------+------+-----+---------+-------+
5、添加字段
alter table student add idcard char(18);
6、删除字段
alter table student drop idcard;
7、删除表
drop table student;
标签：+-------+-------------------+------+-----+---------+-------+,
删除,
char,
修改,
student,
From： https://www.cnblogs.com/ygbh/p/17016702.html