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select s.name from friends f join packages p1
on f.friend_ID=p1.ID
join packages p2 on f.ID=p2.ID
join students s
on s.id=f.id
where p1.salary>p2.salary
order by p1.salary
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Placements
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select s.name from friends f join packages p1 on f.friend_ID=p1.ID join packages p2 on f.ID=p2.ID join students s on s.id=f.id where p1.salary>p2.salary order by p1.salary