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select department AS "Department",
employee AS "Employee",
salary AS salary
from
(select
d.name as department,
e.name as employee,
e.salary as salary,
dense_rank() over (partition by d.name order by e.salary desc) as ranked
from Employee as e
join department as d on
e.departmentid=d.id) as ed
where ranked=1
order by 1,2 desc;