

select Email from
(
select Email, count(Email) as num
from Person
group by Email
) as statistic
where num > 1
;解析:

代表

然后根据比较要判断那个

大于就输出就行了.


select Email from
(
select Email, count(Email) as num
from Person
group by Email
) as statistic
where num > 1
;解析:

代表

然后根据比较要判断那个

大于就输出就行了.