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# Delete Duplicate Emails LeetCode Solution

## Problem – Delete 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 delete all the duplicate emails, keeping only one unique email with the smallest `id`. Note that you are supposed to write a `DELETE` statement and not a `SELECT` one.

After running your script, the answer shown is the `Person` table. The driver will first compile and run your piece of code and then show the `Person` table. The final order of the `Person` table does not matter.

The query result format is in the following example.

Example 1:

``````Input:
Person table:
+----+------------------+
| id | email            |
+----+------------------+
| 1  | john@example.com |
| 2  | bob@example.com  |
| 3  | john@example.com |
+----+------------------+
Output:
+----+------------------+
| id | email            |
+----+------------------+
| 1  | john@example.com |
| 2  | bob@example.com  |
+----+------------------+
Explanation: john@example.com is repeated two times. We keep the row with the smallest Id = 1.``````

## Delete Duplicate Emails LeetCode Solution in Oracle

`````` delete from Person where id not in (select min(id) from person group by email);
``````

## Delete Duplicate Emails LeetCode Solution in MS SQL Server

``````delete from person
where id not in (
select Min(id)
from person
group by email
)
```
``````

## Delete Duplicate Emails LeetCode Solution in My SQL

``````DELETE p1 FROM Person p1, Person p2 WHERE p1.Email = p2.Email AND p1.Id > p2.Id;
``````
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