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A medium SQL mock interview question on DataDriven, with an AI interviewer who asks follow-up questions and a hire or no-hire decision at the end.
- 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 and run your SQL against a real database
- Answer the interviewer's follow-up questions, then get a hire or no-hire decision