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The Regional Cost Reconciliation

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, staff

Interview Prompt

Given three tables representing inventory events: transactions (additions), orders (subtractions), and cloud_costs (positive or negative corrections): write a query that computes a running inventory balance for each product. Show every event with the balance after that event, ordered chronologically.

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