mysql SQL

显示所有字段名

select COLUMN_NAME,COLUMN_COMMENT from information_schema.COLUMNS where table_name = 'your_table_name';

删除字段：

alter table `good_basic` drop column `isOTC` ;

 

 

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：