oracle 按某个字段查询重复数据

 /*
 手机号为重复的会员，获取其最大会员id,对应的会员信息
 */
SELECT * FROM MEMBER a WHERE a.member_id IN (
SELECT MAX(member_id) FROM MEMBER b WHERE b.mobile  IN (SELECT mobile FROM (
                                                        SELECT t.mobile,t.mobile_state,t.is_delete FROM MEMBER t 
                                                        WHERE t.is_delete='N'AND t.mobile_state='Y'   AND t.mobile='mobile'
                                                        GROUP BY t.mobile,t.mobile_state,t.is_delete HAVING COUNT(*)>1
                                                                                    )
                                )