LeetCode 182. Duplicate Emails

Description

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

SQL Schema

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

+----+---------+
| Id | Email   |
+----+---------+
| 1  | a@b.com |
| 2  | c@d.com |
| 3  | a@b.com |
+----+---------+

For example, your query should return the following for the above table:

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

Note: All emails are in lowercase.

Explanation

group by and having count()

SQL Solution

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