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182. duplicate-emails 查找重复的电子邮箱

难度: Easy

刷题内容

原题连接

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

内容描述

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。

解题方案

思路 1

select Email
from Person
group by Email
having count(1)>1

或者

select Email from Person group by Email having count(Email) > 1


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