Rolling Revenue Average
A hard SQL mock interview question on DataDriven. Practice with AI-powered feedback, real code execution, and a hire/no-hire decision.
- Domain
- SQL
- Difficulty
- hard
- Seniority
- L5
Interview Prompt
We track every transaction on our marketplace and want a smoothed view of revenue over time. Roll revenue up by month, then report a 3-month rolling average of those monthly totals for each month, oldest to newest.
Summary
Smooth out the revenue bumps. The trend matters more.
How This Interview Works
- Read the vague prompt (just like a real interview)
- Ask clarifying questions to the AI interviewer
- Write your sql solution with real code execution
- Get instant feedback and a hire/no-hire decision