题目描述

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  | a@b.com |
| 2  | c@d.com |
| 3  | a@b.com |
+----+---------+

根据以上输入,你的查询应返回以下结果:

+---------+
| Email   |
+---------+
| a@b.com |
+---------+

说明:所有电子邮箱都是小写字母。

链接:https://leetcode-cn.com/problems/duplicate-emails

题解

# Write your MySQL query statement below
SELECT Email
FROM Person
GROUP BY Email
HAVING count(Email) > 1;

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