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# Duplicate Emails LeetCode Solution

## Problem – Duplicate Emails LeetCode Solution

SQL Schema

Table: `Person`

``````+-------------+---------+
| Column Name | Type    |
+-------------+---------+
| id          | int     |
| email       | varchar |
+-------------+---------+
id is the primary key column for this table.
Each row of this table contains an email. The emails will not contain uppercase letters.
``````

Write an SQL query to report all the duplicate emails.

Return the result table in any order.

The query result format is in the following example.

Example 1:

``````Input:
Person table:
+----+---------+
| id | email   |
+----+---------+
| 1  | a@b.com |
| 2  | c@d.com |
| 3  | a@b.com |
+----+---------+
Output:
+---------+
| Email   |
+---------+
| a@b.com |
+---------+
Explanation: a@b.com is repeated two times.``````

## Duplicate Emails LeetCode Solution in MySQL

``````SELECT Email from Person
Group By Email
Having Count(*) > 1;
``````

## Duplicate Emails LeetCode Solution in MS SQL Server

``````with cte as
(SELECT email, count(id) cnt
from Person
group by email)
select email from cte
where cnt > 1
``````

## Duplicate Emails LeetCode Solution in Oracle

``````SELECT email AS Email
FROM Person
GROUP BY email
HAVING COUNT(email) > 1
``````
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