Second Purchase
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
- L5
Interview Prompt
The onboarding team is studying second-purchase behavior. For each user, find their second purchase ordered by transaction_date and return its user_id, total_amount, and transaction_date.
Summary
The first buy is curiosity. The second is commitment.
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