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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

Interview Prompt

Data science wants to model spending trends per user over time. For every row in transactions, pull that user's previous transaction amount (by transaction_date) onto the same row, leaving the value empty on a user's first transaction. Return the user_id, total_amount, transaction_date, and the previous amount.

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