mysql SQL
阿新 • • 發佈:2017-06-28
change region uniq sch tab move iso null column
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顯示所有字段名
select COLUMN_NAME,COLUMN_COMMENT from information_schema.COLUMNS where table_name = ‘your_table_name‘;
刪除字段:
alter table `good_basic` drop column `isOTC` ;
- ALTER TABLE `user_movement_log` CHANGE `GatewayId` `GatewayId` int not null default 0 AFTER RegionID
- //主鍵
- alter table tabelname add new_field_id int(5) unsigned default 0 not null auto_increment ,add primary key (new_field_id);//增加一個新列
- alter table t2 add d timestamp;
- alter table infos add ex tinyint not null default ‘0‘;//刪除列
- alter table t2 drop column c;//重命名列
- alter table t1 change a b integer;
- //改變列的類型
- 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);加主關鍵字的索引
- mysql> alter table tablename add primary key(id);加唯一限制條件的索引
- mysql> alter table tablename add unique emp_name2(cardnumber);刪除某個索引
- mysql>alter table tablename drop index emp_name;修改表:
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mysql SQL