leetcode数据库sql之Delete Duplicate Emails

leetcode原文引用：

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  | john@example.com |
| 2  | bob@example.com  |
| 3  | john@example.com |
+----+------------------+
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  | john@example.com |
| 2  | bob@example.com  |
+----+------------------+

我的sql语句：

DELETE FROM Person
WHERE
    id NOT IN (SELECT
        id
    FROM
        (SELECT
            MIN(id) AS id
        FROM
            Person
        GROUP BY email) AS a);