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 | a@b.com | | 2 | c@d.com | | 3 | a@b.com | +----+---------+
根据以上输入，你的查询应返回以下结果：
+---------+ | Email | +---------+ | a@b.com | +---------+
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;SELECT DISTINCT p1.email
FROM person AS p1,
person AS p2
WHERE p1.id != p2.id
AND p1.email = p2.email;