Oracle刪除多字段重復數據，只保留一條記錄

 

前提：表user_info，字段Id(主鍵)，age，sex

 

刪除除主鍵id外，age和sex字段重復的數據，只留有rowid最小的記錄

delete from user_INFO a where (a.age,a.sex) in (select age，sex group by age，sex having count(*) > 1) and rowid not in (select min(rowid) from user_INFO group by age，sex having count(*)>1);