delete-duplicate-emails

Description

Write a SQL query to delete all duplicate email entries in a table named Person, keeping only unique emails based on its smallest Id.

Id	Email
1	[email protected]
2	[email protected]
3	[email protected]

Id is the primary key column for this table. For example, after running your query, the above Person table should have the following rows:

Id	Email
1	[email protected]
2	[email protected]

Note:

Your output is the whole Person table after executing your sql. Use delete statement.

Solution

delete `p1` from `Person` `p1`, `Person` `p2` where
`p1`.`Email` = `p2`.`Email`
and `p1`.`Id` > `p2`.`Id`;

Note

If you have a better solution, you can star and fork Leetcode-database-problem then create a pull request.