mysql 命令
1 修改表名
ALTER TABLE table_name RENAME TO new_table_name
例如 ALTER TABLE admin_user RENAME TO a_user
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;