Category Buyers
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
The merchandising team is deciding how to concentrate their next promotional push. For each product category, they need to know how many unique customers made a purchase and how much revenue those purchases generated in total. Only include categories that have attracted at least three unique buyers , niche categories with a smaller audience aren't in scope. Rank from the most revenue to the least.
Summary
Which categories have the broadest reach?
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