QuerydrillAverage salary 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
For each dept_id, return the dept_id and the average salary. Leave out employees without a department.
What this exercise teaches
GROUP BY puts all NULLs in one group, so filter them out when they should not count.
A hint if you get stuck
Filter the NULL departments in WHERE, then GROUP BY dept_id.
This exercise is part of Pro
Pro unlocks all 60 exercises, with worked solutions and progress saved to your account. The free exercises work without an account.
You create a free account first, so Pro is attached to it.
Monthly is charged today and then every month until you cancel, in one click from your account page. Lifetime is one payment with no renewals. Full refund within 14 days of paying.