The Biggest Fish
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
- mid
Interview Prompt
We're planning loyalty outreach around whoever spends the most in each product category, where every purchase in `transactions` counts toward a customer's total in the category its product carries in `products`. Return each category's top spender with that total.
Summary
In every aisle, one customer outspends the rest. Find them.
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