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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。
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select Email from Person group by 1 having count(1)>1