力扣——查找重复的电子邮箱（数据库的题

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 |
+---------+

# Write your MySQL query statement below
select Email from person group by email having count(email)>1;

 

转载于:https://www.cnblogs.com/JAYPARK/p/10289184.html