Multi-Category Buyers
A hard SQL mock interview question on DataDriven. Practice with AI-powered feedback, real code execution, and a hire/no-hire decision.
- Domain
- SQL
- Difficulty
- hard
- Seniority
- L4
Interview Prompt
The recommendations team is building a cross-category shopper segment. Ignoring products with no category on file, find users whose purchases span more than one product category. Return each qualifying username and how many categories they've bought from.
Summary
One-category shoppers are boring.
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