leetcode:182. 查找重复的电子邮箱
发现以下两种方法都能够AC,请问哪个更为准确,Count()里面是Email还是Id
刚开始学,迷惑
# Write your MySQL query statement below
select Email from Person group by Email having count(Email)>1;
# Write your MySQL query statement below
select Email from Person group by Email having count(Id)>1;