删除表中多余的重复记录，重复记录是根据单个字段（Id）来判断，只留有rowid最小的记录

delete from Resource where Title in (select Title from Resource group by Title having count(Title) > 1) and   Id not in (select min(Id) from Resource group by Title having count(Title)>1)delete from Resource where Title in (select Tit