在oracle中，可以利用count()函数配合select查询语句来查询重复的数据，语法为“select userCode from user group by userCode having count(userCode)>1”。
本教程操作环境：Windows10系统、Oracle 11g版、Dell G3电脑。
oracle怎么查询重复的数据
1、查找表中多余的重复记录，重复记录是根据单个字段（userCode）来判断
select * from userwhere userCodein (select userCode from user group by userCode having count (userCode) > 1)
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2、删除表中多余的重复记录，重复记录是根据单个字段（userCode）来判断，只留有rowid最小的记录
delete from user where userCode in (select userCode from user group by userCode having count (peopleId) > 1)and rowid not in (select min(rowid) from user group by userCode having count(userCode)>1)
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3、查找表中多余的重复记录（多个字段）
select * from user awhere (a.userCode,a.userName) in (select userCode,userName from user group by userCode,userName having count(*) > 1)
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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 user awhere (a.userCode,a.userName) in (select userCode,userName from user group by userCode,userName having count(*) > 1)and rowid not in (select min(rowid) from user group by userCode,userName having count(*)>1)
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5、查找表中多余的重复记录（多个字段），不包含rowid最小的记录
select * from user awhere (a.userCode,a.userName) in (select userCode,userName from user group by userCode,userName having count(*) > 1)and rowid not in (select min(rowid) from user group by userCode,userName having count(*)>1)
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