[LeetCode]#182. Duplicate Emails

Environment: Mysql

Key technique: N/A

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
group by Email
having count(Email) > 1;

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