Repeat Purchase Window
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
- L4
Interview Prompt
A churn model needs repeat-purchase signals. Find users who made another purchase within 1 to 7 days of a previous transaction, excluding same-day transactions. Return each qualifying user ID once.
Summary
The retention squad is looking for repeat purchasers.
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