mysql 添加字段、删除字段、调整字段顺序

ALTER TABLE — 更改表属性 
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 
mysql alter 语句用法,添加、修改、删除字段等 

//主键549830479 

   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549830479 

   alter table t2 add d timestamp; 
alter table infos add ex tinyint not null default '0'; 

//删除列549830479 

   alter table t2 drop column c; 

//重命名列549830479 

   alter table t1 change a b integer; 


//改变列的类型549830479 

   alter table t1 change b b bigint not null; 
alter table infos change list list tinyint not null default '0'; 

//重命名表549830479 

   alter table t1 rename t2; 

加索引549830479 

   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549830479 

mysql> alter table tablename add primary key(id); 

加唯一限制条件的索引549830479 

  mysql> alter table tablename add unique emp_name2(cardnumber); 

删除某个索引549830479 

   mysql>alter table tablename drop index emp_name; 

修改表：549830479 

增加字段：549830479 

   mysql> ALTER TABLE table_name ADD field_name field_type; 

修改原字段名称及类型：549830479 

   mysql> ALTER TABLE table_name CHANGE old_field_name new_field_name field_type; 

删除字段：549830479 

   mysql> ALTER TABLE table_name DROP field_name;