摘要：
select P.FirstName,P.Lastname,A.City,A.State from Person P left join Address A on P.PersonId = A.PersonId; 阅读全文
摘要：
# Write your MySQL query statement belowdelete from `Person`where Id not in(select * from (select min(Id) from `Person` group by Email) as tmp); //删除P 阅读全文