MySQL添加字段:
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123 | 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:
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1 | alter table `user_movement_log` drop column Gatewayid |
调整字段顺序:
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1234567891011121314151617181920212223242526272829303132333435 | 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:
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12345 | 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; |