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 | 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;