QuerydrillTop earner per department
An SQL exercise from Querydrill. Solve it with a SQL editor in your browser, checked on the rows it returns and again on changed data, and it is checked the moment you submit.
The task
Return the dept_id, name and salary of the highest-paid employee in each department. Ignore employees without a department.
What this exercise teaches
Top-N per group is a classic interview question: rank in a subquery or CTE, then filter on the rank.
A hint if you get stuck
Rank inside each department in a subquery, then keep rank 1 in the outer query.
This exercise is part of Pro
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