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Second Purchase

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

Interview Prompt

The onboarding team wants to study second-purchase behavior. For each user with more than one transaction, order their transactions by transaction_date and isolate the second one. Return the user_id, total_amount, and transaction_date of that second purchase.

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