Last updated on January 21st, 2025 at 10:58 pm

Here, we see the Duplicate Emails LeetCode Solution. This Leetcode problem is solved using MySQL and Pandas.

List of all LeetCode Solution

Level of Question

Easy

Duplicate Emails LeetCode Solution

1. Problem Statement

Column Name	Type
id	int
email	varchar

id is the primary key (column with unique values) for this table. Each row of this table contains an email. The emails will not contain uppercase letters.

Write a solution to report all the duplicate emails. Note that it’s guaranteed that the email field is not NULL.

Return the result table in any order.

The result format is in the following example.

Example 1:
Input:

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.

2. Code Implementation in Different Languages

2.1 Duplicate Emails MySQL

select 
  Email 
from 
  Person 
group by 
  Email 
having 
  count(Email) > 1;