oracle中如何查询数据表中重复的数据？ 其实可以用很简单SQL语句将其查询出来。如果想查询数据表中某一个字段重复（这里假设这个字段名是ID1），可以使用以下SQL语句。select Table1.*from Table1 right join(select ID1 From Table1 Group by ID1 having Count(ID1)>；1)T on Table1.id1=T.id1 如果想查询数据表某两个字段重复，则可以使用如下语句查询。select Table1.*from Table1 right join(select ID1，ID2 From Table1 Group by ID1，ID2 having Count(ID1)>；1 and Count(ID2)>；1)T 注：上面代码中出现的ID1和ID2字段均不是数据表主键。
oracle求一个查询重复数据SQL语句 |select IDTP，IDNO，CUSTNAME from table where IDTP|2113IDNO in(select IDTP|IDNO from table group by IDTP，IDNO having count(*)>；=2minusselect IDTP|IDNO from table group by IDTP|IDNO，CUSTNAME having count(*)=1)还有其他写法，稍微5261有点4102麻烦，而且没有环1653境没办法测试。
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 。
