学步园

ALTER TABLE — 更改表属性<br /> 添加字段： </p> <p>alter table `user_movement_log`<br /> Add column GatewayId int not null default 0 AFTER `Regionid` (在哪个字段后面添加) </p> <p>删除字段： </p> <p>alter table `user_movement_log` drop column Gatewayid </p> <p>调整字段顺序： </p> <p>ALTER TABLE `user_movement_log` CHANGE `GatewayId` `GatewayId` int not null default 0 AFTER RegionID<br /> mysql alter 语句用法,添加、修改、删除字段等 </p> <p>//主键549830479 </p> <p> alter table tabelname add new_field_id int(5) unsigned default 0 not null auto_increment ,add primary key (new_field_id); </p> <p>//增加一个新列549830479 </p> <p> alter table t2 add d timestamp;<br /> alter table infos add ex tinyint not null default '0'; </p> <p>//删除列549830479 </p> <p> alter table t2 drop column c; </p> <p>//重命名列549830479 </p> <p> alter table t1 change a b integer; </p> <p>//改变列的类型549830479 </p> <p> alter table t1 change b b bigint not null;<br /> alter table infos change list list tinyint not null default '0'; </p> <p>//重命名表549830479 </p> <p> alter table t1 rename t2; </p> <p>加索引549830479 </p> <p> mysql> alter table tablename change depno depno int(5) not null;<br /> mysql> alter table tablename add index 索引名 (字段名1[，字段名2 …]);<br /> mysql> alter table tablename add index emp_name (name); </p> <p>加主关键字的索引549830479 </p> <p>mysql> alter table tablename add primary key(id); </p> <p>加唯一限制条件的索引549830479 </p> <p> mysql> alter table tablename add unique emp_name2(cardnumber); </p> <p>删除某个索引549830479 </p> <p> mysql>alter table tablename drop index emp_name; </p> <p>修改表：549830479 </p> <p>增加字段：549830479 </p> <p> mysql> ALTER TABLE table_name ADD field_name field_type; </p> <p>修改原字段名称及类型：549830479 </p> <p> mysql> ALTER TABLE table_name CHANGE old_field_name new_field_name field_type; </p> <p>删除字段：549830479 </p> <p> mysql> ALTER TABLE table_name DROP field_name;

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