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Monthly Cloud Cost Forecast Error

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

We want a naive forecast model for monthly cloud costs. Sum cloud cost amounts at a monthly level. Use the previous month's total as the forecast for the current month, then calculate the absolute percentage error versus actual. Show year-month, actual cost, forecasted cost, and percentage error.

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