標籤:
添加欄位:
alter table `user_movement_log`
Add column GatewayId int not null default 0 AFTER `Regionid` (在哪個欄位後面添加)
刪除欄位:
alter table `user_movement_log` drop column Gatewayid
調整欄位順序:
ALTER TABLE `user_movement_log` CHANGE `GatewayId` `GatewayId` int not null default 0 AFTER RegionID
//主鍵
alter table tabelname add new_field_id int(5) unsigned default 0 not null auto_increment ,add primary key (new_field_id);
//增加一個新列
alter table t2 add d timestamp;
alter table infos add ex tinyint not null default ‘0‘;
//刪除列
alter table t2 drop column c;
//重新命名列
alter table t1 change a b integer;
//改變列的類型
alter table t1 change b b bigint not null;
alter table infos change list list tinyint not null default ‘0‘;
//重新命名表
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 (欄位名1[,欄位名2 …]);
mysql> alter table tablename add index emp_name (name);
加主關鍵字的索引
mysql> alter table tablename add primary key(id);
加唯一限制條件的索引
mysql> alter table tablename add unique emp_name2(cardnumber);
刪除某個索引
mysql>alter table tablename drop index emp_name;
修改表:
增加欄位:
mysql> ALTER TABLE table_name ADD field_name field_type;
修改原欄位名稱及類型:
mysql> ALTER TABLE table_name CHANGE old_field_name new_field_name field_type;
刪除欄位:
mysql> ALTER TABLE table_name DROP field_name;
mysql更改表結構:添加、刪除、修改欄位、調整欄位順序