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Category-Specific Product Volume

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

Domain
SQL
Difficulty
easy
Seniority
junior

Interview Prompt

Given a transactions table with merchant_id and payment_method, write a query that returns the total transaction volume from mobile payments for each merchant. Merchants with zero mobile transactions should appear with a value of 0.

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