mysql下的常用操作

alter table `user_movement_log`Add column GatewayId int not null default 0 AFTER `Regionid` (在哪个字段后面添加) 

alter table `user_movement_log` drop column Gatewayid

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： 

    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;