SQL重复记录查询

今天在LeetCode上面看到一道题,题目不难,而且考的点也很基础,但是感觉可以归纳出一些内容来,所以就自己归纳了一下。题目如下 题目并不难,我写的sql如下: select distinct p1.Email from Person as p1 where p1.Email in (select p2.Email from Person as p2 group by p2.Email havin

>>阅读原文<<