182 Duplicate Emails

Description

Table: Person

• id is the primary key column for this table.
• Each row of this table contains an email. The emails will not contain uppercase letters.

Problem Statement

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:

Output:

Explanation: a@b.com is repeated two times.

Solution

This is simple problem involving aggreation. You need to find emails where the COUNT of emails is greater than 1.

1SELECT DISTINCT email 
2    FROM Person
3    GROUP BY email
4    HAVING COUNT(1) > 1;