leetcode:182. Duplicate Emails

182. Duplicate Emails

Description

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.

Answer

select Email from Person group by Email having count(Email)>1