ORACLE查询重复数据 oracle重复数据可用聚合函数和having语句来实现。如test表中有如下数据：现在要求查询name中有重复的数据，可用如下语句：select name from test group by name having count(*)>；1；结果如图：
oracle怎样查出表中重复列的数据？ 1、查出表中重复列的数据：select a，count(*)from table group by a having count(*)>；12、查重复次数最多的列：select a，num fromselect a，count(*)num from table group by a having count(*)>；1order by num desc此外，还有1、查询一个表中所有字段都相同的记录比如现在有一人员表（表名：peosons）若想将姓名、编号、住址这三个字段完全相同的记录查询出来：select p1.*from persons p1，persons p2 where p1.name=p2.name and p1.id=p2.id and p1.address=p2.address group by p1.name，p1.id，p1.address having count(*)>；1；或者：select p1.*from persons p1，persons p2 where p1.name=p2.nameand p1.id=p2.id and p1.address=p2.address and p1.rowid<；>；p2.rowid；或者：(下面这条语句执行效率更高)select*from(select p.*，row_number()over(partition by name，id，address order by name)rn from persons p)where rn>；1；2、查询一个表中某字段相同的记录语法：select p1.*from 表名 p1，(select 字段 from 表名 group by 字段 having count(*)>；1)p2 where p1.字段=p2.字段；select p1.*from persons p1，(select address from persons group by address 。
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 。
