182. Duplicate Emails LeetCode Solution | Easy Approach

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Duplicate Emails

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  | [email protected] |
| 2  | [email protected] |
| 3  | [email protected] |
+----+---------+
Output: 
+---------+
| Email   |
+---------+
| [email protected] |
+---------+
Explanation: [email protected] is repeated two times.

Duplicate Emails Solutions

Time: O(n)
Space: O(n)

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