xiaohui2856的专栏

select * from pmt_module t start with t.parent_id='1142001001' connect by prior t.module_id=t.parent_id;

1、查找表中多余的重复记录，重复记录是根据单个字段（peopleId）来判断 select * from people where peopleId in (select peopleId from people group by peopleId having count(peopleId) > 1) 2、删除表中多余的重复记录，重复记录是根据单个字段（peopl...