Oracle删除重复的数据，Oracle数据去重复
Oracle 数据库中查询重复数据：
select*fromemployeegroupbyemp_namehavingcount(*)>1;
Oracle 查询可以删除的重复数据
selectt1.*fromemployeet1where(t1.emp_name)in(SELECTt2.emp_namefromemployeet2groupbyemp_namehavingcount(*)>1)andt1.emp_idnotin(selectmin(t3.emp_id)fromemployeet3groupbyemp_namehavingcount(*)>1);
Oracle删除重复数据
deletefromemployeet1where(t1.emp_name)in(SELECTt2.emp_namefromemployeet2groupbyemp_namehavingcount(*)>1)andt1.emp_idnotin(selectmin(t3.emp_id)fromemployeet3groupbyemp_namehavingcount(*)>1);