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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