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select s.name
from friends f
join students s on f.id = s.id
join students t on f.friend_ID = t.id
join packages p on f.id = p.id
join packages k on f.friend_ID = k.id
where p.salary < k.salary
order by k.salary;
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Placements
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select s.name from friends f join students s on f.id = s.id join students t on f.friend_ID = t.id join packages p on f.id = p.id join packages k on f.friend_ID = k.id where p.salary < k.salary order by k.salary;