文章分类:数据库
- ALTER TABLE — 更改表属性
- 添加字段:
- alter table `user_movement_log`
- Add column GatewayId int not null default 0 AFTER `Regionid` (在哪个字段后面添加)
- 删除字段:
- alter table `user_movement_log` drop column Gatewayid
- 调整字段顺序:
- ALTER TABLE `user_movement_log` CHANGE `GatewayId` `GatewayId` int not null default 0 AFTER RegionID
- mysql alter 语句用法,添加、修改、删除字段等
- //主键549830479
- alter table tabelname add new_field_id int(5) unsigned default 0 not null auto_increment ,add primary key (new_field_id);
- //增加一个新列549830479
- alter table t2 add d timestamp;
- alter table infos add ex tinyint not null default '0';
- //删除列549830479
- alter table t2 drop column c;
- //重命名列549830479
- alter table t1 change a b integer;
- //改变列的类型549830479
- alter table t1 change b b bigint not null;
- alter table infos change list list tinyint not null default '0';
- //重命名表549830479
- alter table t1 rename t2;
- 加索引549830479
- mysql> alter table tablename change depno depno int(5) not null;
- mysql> alter table tablename add index 索引名 (字段名1[,字段名2 …]);
- mysql> alter table tablename add index emp_name (name);
- 加主关键字的索引549830479
- mysql> alter table tablename add primary key(id);
- 加唯一限制条件的索引549830479
- mysql> alter table tablename add unique emp_name2(cardnumber);
- 删除某个索引549830479
- mysql>alter table tablename drop index emp_name;
- 修改表:549830479
- 增加字段:549830479
- mysql> ALTER TABLE table_name ADD field_name field_type;
- 修改原字段名称及类型:549830479
- mysql> ALTER TABLE table_name CHANGE old_field_name new_field_name field_type;
- 删除字段:549830479
- mysql> ALTER TABLE table_name DROP field_name;
本文转自holy2009 51CTO博客,原文链接:http://blog.51cto.com/holy2010/463572