编写一个 SQL 查询，查找 Person 表中所有重复的电子邮箱。
示例：
+----+---------+ | Id | Email | +----+---------+ | 1 | [email protected] | | 2 | [email protected] | | 3 | [email protected] | +----+---------+
根据以上输入，你的查询应返回以下结果：
+---------+ | Email | +---------+ | [email protected] | +---------+
说明：所有电子邮箱都是小写字母。
select Email from Person group by Email having count(Email) > 1