The Cannibalization Report
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
- L6
Interview Prompt
For each product whose first transaction occurred in the last 6 months, compare the category's total sales in the 30 days before that product's first sale versus 30 days after. Show the product name, category, pre-entry sales, post-entry sales, and the percentage change.
Summary
The new product launched. The old one suffered.
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