删除以id为主键地重复记录

要求能够通过一个sql语句删除所有重复的记录，并只留下重复记录中的一条数据

思路：

 1 --- 删除重复的角色权限配置   2 DELETE FROM sys_roleright_t t4 WHERE t4.FRIGHTID IN (      3     SELECT t1.FRIGHTID   4     FROM sys_roleright_t t1   5     JOIN (SELECT min(t2.FRIGHTID) AS FRIGHTID, t2.FROLEID, t2.FAPPID, count(0)  6                  FROM sys_roleright_t t2   7                  GROUP BY t2.FROLEID, t2.FAPPID   8                  HAVING count(0) > 1  9     ) t3 ON t1.FROLEID = t3.FROLEID AND t1.FAPPID = t3.FAPPID  10     WHERE t1.FRIGHTID > t3.FRIGHTID 11 );