Duplicate Emails · LeetCode

Description

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.

Solution(mysql)

# Write your MySQL query statement below
select Email
from (
    select Email, count(Id) as Count
    from Person
    group by Email
) as EmailCount
where EmailCount.Count > 1;