添加字段:
alter table `user_movement_log`
Add column GatewayId int not null default 0 AFTER `Regionid` (在哪個(gè)字段后面添加)
刪除字段:
alter table `user_movement_log` drop column Gatewayid
調(diào)整字段順序:
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(gè)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);加主關(guān)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(gè)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;修改原字段名稱及類型:
mysql> ALTER TABLE table_name CHANGE old_field_name new_field_name field_type;刪除字段:
mysql> ALTER TABLE table_name DROP field_name;
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