多对多关系表中删除重复记录

表aa

columns　　data type

sid　　　　　　number

pid　　　　　　number

sql:

select * from aa where (sid,pid) in (

select sid,pid from aa group by sid,pid having count(sid) > 1

) and rowid not in (select min(rowid) from aa group by sid,pid having count(sid) > 1)