182. 查找重复的电子邮箱

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  | [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。

分析

使用group by,过滤count(Email) > 1的记录

代码

# Write your MySQL query statement below
select Email from Person group by Email having count(Email) > 1;

题目链接

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

你可能感兴趣的:(182. 查找重复的电子邮箱)