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