182. Duplicate Emails

Question 182

https://leetcode.com/problems/maximum-depth-of-binary-tree/description/

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

+----+---------+
| Id | Email   |
+----+---------+
| 1  | [e-mail] |
| 2  | [e-mail] |
| 3  | [e-mail] |
+----+---------+

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

+---------+
| Email   |
+---------+
| [e-mail] |
+---------+

Note: All emails are in lowercase.

Answer

By MySQL

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