Duplicate Emails
Created: September 12, 2018 by [lek-tin]
Last updated: September 12, 2018
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
# Write your MySQL query statement below
SELECT email
FROM Person
WHERE email
IN (
SELECT email
FROM Person
GROUP BY email
HAVING COUNT(*) > 1
)
GROUP BY email