The Biggest Fish
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
- mid
Interview Prompt
A loyalty team wants the customer who spends the most in each product category so they can plan outreach. For every category, return that customer and their total spend across the category.
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 your sql solution with real code execution
- Get instant feedback and a hire/no-hire decision