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;

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