【经典SQL】删除表中重复的记录

考虑到这种SQL用到的还是比较多，故在此记录一下。

问题  从表中删除重复的记录，考虑如下表结构信息：

create table dupes (id integer,name varchar(10));
insert into dupes values(1,'NAPOLEON');
insert into dupes values(2,'DYNAMITE');
insert into dupes values(3,'DYNAMITE');
insert into dupes values(4,'SHE SELLS');
insert into dupes values(5,'SHE SELLS');
insert into dupes values(6,'SHE SELLS');
insert into dupes values(7,'SHE SELLS');

select * from dupes order by 1;

对于每个像“SHE SELLS”这样重复的姓名组，只任意保留其中一个的ID,并将其余的记录删除掉。

解决方案如下：

delete from dupes where id not in (select min(id) from dupes group by name)