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Deduplicated Sales Volume by Category

A medium SQL mock interview question on DataDriven. Practice with AI-powered feedback, real code execution, and a hire/no-hire decision.

Domain
SQL
Difficulty
medium
Seniority
senior

Interview Prompt

Given a transactions table and a products table, first deduplicate transactions by keeping the row with the lowest transaction_id when multiple rows share the same user_id, product_id, total_amount, and transaction_date. Then compute the total sales amount per product category, counting only positive amounts.

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