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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
- Seniority
- L4
Interview Prompt
Data science is modeling how each user's spending moves over time. For every row in transactions, bring that user's previous transaction amount onto the same row, and return the user_id, total_amount, transaction_date, and that previous amount.
Summary
What did they spend last time? Context changes everything.
How This Interview Works
- Read the vague prompt (just like a real interview)
- Ask clarifying questions to the AI interviewer
- Write your sql solution with real code execution
- Get instant feedback and a hire/no-hire decision