182. Duplicate Emails

Duplicate Emails

Problem Description

SQL Schema

    Create table If Not Exists Person (id int, email varchar(255))

    Truncate table Person

    insert into Person (id, email) values ('1', 'a@b.com')

    insert into Person (id, email) values ('2', 'c@d.com')

    insert into Person (id, email) values ('3', 'a@b.com')

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.

Solution

# Write your MySQL query statement below
SELECT Email FROM Person GROUP BY Email HAVING  count(*) > 1;

Conclusion

That’s all folks! In this post, we solved LeetCode problem #182. Duplicate Emails

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