7-Day Token Retention
A medium SQL mock interview question on DataDriven, with an AI interviewer who asks follow-up questions and a hire or no-hire decision at the end.
- Domain
- SQL
- Difficulty
- medium
- Seniority
- L5
Interview Prompt
We need a 7-day retention curve for API tokens scoped exactly 'write'. For each of the first seven issuance dates, report how many different owners were issued an active write token carrying traffic that day, and how many of those owners still held one a week later.
Summary
Premium tokens, day by day.
How This Interview Works
- Read the vague prompt (just like a real interview)
- Ask clarifying questions to the AI interviewer
- Write and run your SQL against a real database
- Answer the interviewer's follow-up questions, then get a hire or no-hire decision