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;