max_hello的博客

踩过的坑

1、sql 查表重复数据  Select * From 表XX Where user_id In (Select user_id From 表XX Group By user_id Having Count(*)>1) 2、sql 查表重复数据  Select user_id From 表XX  Group By user_id Having Count(*)>1删除重复数据保留一条记...