Top Product Category by Transactions
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
Our all-time category leaderboard crowns a single winner and hides how the lead has changed hands from year to year. For each recent year in `transactions`, show the year, the `products` category with the most purchases that year and its purchase count.
Summary
Organic purchases, no marketing nudge. Which category wins?
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