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select T.Name
from
(select S.NAME,J.FRIEND_ID,P.Salary from students S inner join friends J on S.ID=J.ID inner join Packages P ON S.ID=P.ID ) T inner join students Q on T.FRIEND_ID=Q.ID inner join Packages PK ON T.FRIEND_ID=PK.ID
WHERE T.Salary
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select T.Name from (select S.NAME,J.FRIEND_ID,P.Salary from students S inner join friends J on S.ID=J.ID inner join Packages P ON S.ID=P.ID ) T inner join students Q on T.FRIEND_ID=Q.ID inner join Packages PK ON T.FRIEND_ID=PK.ID WHERE T.Salary