Leetcode 196 Delete Duplicate Emails

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]  |

+----+------------------+

delete a from Person a, Person b

where a.Email = b.Email and a.Id > b.Id