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Monthly Revenue Change

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
mid, senior

Interview Prompt

For each month, compute total transaction revenue, then calculate the percentage change from the prior month, rounded to 2 decimal places. Results should appear chronologically. The first month has no prior month, so show null for its percentage change.

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