182. Duplicate Emails

• Difficulty: Easy

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Problem:

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.

Solutions:

# Write your MySQL query statement below
SELECT Email FROM
(SELECT Email, COUNT(Id) AS C
FROM Person
GROUP BY Email
 ) AS T
WHERE T.C > 1