Repeat Purchases Within a Week
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
- L5
Interview Prompt
We keep a log of customer transactions, each with a user and a purchase date. Find the users who bought at least twice within any 7-day span, returning each user's ID.
Summary
They bought again within seven days.
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