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select s.name
from friends f
join packages p on p.id=f.id
join packages p2 on p2.id=f.friend_id
join students s on s.id = p.id
where p.salary < p2.salary
order by p2.salary
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Placements
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select s.name from friends f join packages p on p.id=f.id join packages p2 on p2.id=f.friend_id join students s on s.id = p.id where p.salary < p2.salary order by p2.salary