leetcode刷题:查找重复的电子邮箱

编写一个 SQL 查询,查找 Person 表中所有重复的电子邮箱。

示例:

+—-+———+
| Id | Email |
+—-+———+
| 1 | [email protected] |
| 2 | [email protected] |
| 3 | [email protected] |
+—-+———+
根据以上输入,你的查询应返回以下结果:

+———+
| Email |
+———+
| [email protected] |
+———+
说明:所有电子邮箱都是小写字母。

sql代码

select email from person group by email having count(email)>=2

sql代码

select DISTINCT a.Email
    from Person a
INNER JOIN
Person b
    WHERE
a.Email=b.Email AND a.id!=b.id;

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转载自blog.csdn.net/sunyuhua_keyboard/article/details/80898314