leetcode_gym/_problems/sql_dupicate_emails.md

layout, title, last_solved, category, leetcode_url, status

layout	title	last_solved	category	leetcode_url	status
page	Duplicate Emails		sql	https://leetcode.com/problems/duplicate-emails/	Attempted

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 |
+---------+

Solution

{% highlight sql %}

select Email from person group by email having count(*)>1

{% endhighlight %}