SQL重複記錄查詢

今天在LeetCode上面看到一道題,題目不難,而且考的點也很基礎,但是感覺可以歸納出一些內容來,所以就自己歸納了一下。題目如下 題目並不難,我寫的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

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