QuerydrillDepartments above average
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 and average salary of every department whose average salary is above the average salary of all employees. Ignore employees without a department when grouping.
What this exercise teaches
HAVING can compare a group's aggregate to a scalar subquery.
A hint if you get stuck
GROUP BY with HAVING, comparing to a subquery on the whole table.
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