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MySQL
select s.name from students s
left join friends f on s.id = f.id
left join packages p on f.id = p.id
left join packages p1 on f.friend_id = p1.id
where p1.salary>p.salary order by p1.salary
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Placements
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MySQL select s.name from students s left join friends f on s.id = f.id left join packages p on f.id = p.id left join packages p1 on f.friend_id = p1.id where p1.salary>p.salary order by p1.salary