Keys That Never Die
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
The security team is auditing API token hygiene. A token with no expiration date (expires IS NULL) lives forever and is a standing risk. What percentage of all API tokens are these never-expiring tokens? Return a single number rounded to 2 decimal places as perpetual_pct.
Summary
Some API keys have no expiry date at all. That should worry someone.
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