题目描述：

Write a SQL query to find all duplicate emails in a table named Person.

+----+---------+
| Id | Email   |
+----+---------+
| 1  | [email protected] |
| 2  | [email protected] |
| 3  | [email protected] |
+----+---------+
For example, your query should return the following for the above table:

+---------+
| Email   |
+---------+
| [email protected] |
+---------+
Note: All emails are in lowercase.

题目大意：

编写一个SQL查询从Person表中找出所有重复的邮箱地址。

例如，上表的查询结果应该返回[email protected]

所有的邮箱地址均为小写字母。

解题思路：

使用GROUP BY和HAVING即可

SQL语句：

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

 

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