关于oracle中查找重复数据简化 查出所有重复了的记录，如果有重复只保留其中一条select*from zhigong a where a.rowid>；(select min(b.rowid)from zhigong b where a.zhigonggh=b.zhigonggh)这样效率高
oracle查重复数据并显示出来 SELECT*FROM t_info aWHERE((SELECT COUNT(*)FROM t_infoWHERE Title=a.Title)>；1)ORDER BY Title DESC一。查找重2113复记录526141021。查找全部重复记录Select*From 表 Where 重复字段1653 In(Select 重复字段 From 表 Group By 重复字段 Having Count(*)>；1)2。过滤重复记录(只显示一条)Select*From HZT Where ID In(Select Max(ID)From HZT Group By Title)注：此处显示ID最大一条记录二。删除重复记录1。删除全部重复记录（慎用）Delete 表 Where 重复字段 In(Select 重复字段 From 表 Group By 重复字段 Having Count(*)>；1)2。保留一条（这个应该是大多数人所需要的^_^）Delete HZT Where ID Not In(Select Max(ID)From HZT Group By Title)注：此处保留ID最大一条记录1、查找表中多余的重复记录，重复记录是根据单个字段（peopleId）来判断select*from peoplewhere peopleId in(select peopleId from people group by peopleId having count(peopleId)>；1)2、删除表中多余的重复记录，重复记录是根据单个字段（peopleId）来判断，只留有rowid最小的记录delete from peoplewhere peopleId in(select peopleId from people group by 。
oracle如何查询不重复数据 可以把重复值e69da5e887aa3231313335323631343130323136353331333361323530删除，可参考：1、查找表中多余的重复记录，重复记录是根据单个字段（peopleId）来判断select*from people where peopleId in(select peopleId from people group by peopleId having count(peopleId)>；1)2、删除表中多余的重复记录，重复记录是根据单个字段（peopleId）来判断，只留有rowid最小的记录delete from people where peopleName in(select peopleName from people group by peopleName having count(peopleName)>；1)and peopleId not in(select min(peopleId)from people group by peopleName having count(peopleName)>；1)3、查找表中多余的重复记录（多个字段）select*from vitae a where(a.peopleId，a.seq)in(select peopleId，seq from vitae group by peopleId，seq having count(*)>；1)4、删除表中多余的重复记录（多个字段），只留有rowid最小的记录delete from vitae a where(a.peopleId，a.seq)in(select peopleId，seq from vitae group by peopleId，seq having count(*)>；1)and rowid not in(select min(rowid)from vitae group by peopleId，seq having count(*)>；1)5。
