题目链接：182. 查找重复的电子邮箱 - 力扣（LeetCode）

题目描述

sql语句

方法1：使用临时表

select Email from
(select Email, count(Email) as numfrom Persongroup by Email
) as statistic
where num > 1
;

方法2：使用having

# Write your MySQL query statement below
select Person.email as email
from Person
group by  email
having  count(email)>1