select distinct P1.Email as Email
from Person P1, Person P2
where P1.Email = P2.Email and P1.Id != P2.Id;
select Email
from Person
group by Email
having count(Email) > 1;
select Email from
(
select Email, count(Email) as num
from Person
group by Email
) as statistic
where num > 1;
1万+



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