MySQL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
//主键
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
alter table t2 add d timestamp;
alter table infos add ex tinyint not null default '0';//删除列
alter table t2 drop column c;//重命名列
alter table t1 change a b integer;
//改变列的类型
alter table t1 change b b bigint not null;
alter table infos change list list tinyint not null default '0';
//重命名表
alter table t1 rename t2;加索引
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
mysql> alter table tablename add primary key(id);加唯一限制条件的索引
mysql> alter table tablename add unique emp_name2(cardnumber);删除某个索引
mysql>alter table tablename drop index emp_name;修改表:
增加字段:
mysql> ALTER TABLE table_name ADD field_name field_type;修改原字段名称及类型:
mysql> ALTER TABLE table_name CHANGE old_field_name new_field_name field_type;删除字段:
mysql> ALTER TABLE table_name DROP field_name;
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