Across the Aisles
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. Find the users whose purchases span more than one product category, ignoring any purchase whose product has no category on file. Return each qualifying user with the number of categories they've bought from, most categories first.
Summary
The best customers never stay in one aisle.
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