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select b.name from packages a, students b, friends c, packages d
where a.id=b.id
and a.id=c.id
and d.id = c.friend_id
and (d.salary-a.salary) > 0
order by d.salary;
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Placements
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select b.name from packages a, students b, friends c, packages d where a.id=b.id and a.id=c.id and d.id = c.friend_id and (d.salary-a.salary) > 0 order by d.salary;