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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
senior

Interview Prompt

Compute a 3-month rolling average of total revenue from transactions, excluding refunds (negative amounts). For each month, the average uses the current month and the two preceding months. Show year-month in YYYY-MM format and the rolling average, sorted chronologically. The first two months will not be true 3-month averages.

How This Interview Works

  1. Read the vague prompt (just like a real interview)
  2. Ask clarifying questions to the AI interviewer
  3. Write your sql solution with real code execution
  4. Get instant feedback and a hire/no-hire decision