Spending Range
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
- L5
Interview Prompt
Data science is modeling per-user spending variability and only cares about customers who have made more than one purchase. For each of those users, return the username, their smallest and largest transaction amount, and the gap between the two, sorted from the widest gap to the narrowest.
Summary
Between the smallest purchase and the biggest lies the story.
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