Smooth Latency
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
Some of our API endpoints look like they are drifting slower as traffic grows, and we want the underlying trend rather than the per-call noise. For each endpoint, walk its calls from oldest to newest (breaking ties by call_id) and, at each call, report the average latency across that call and every earlier one, skipping any call with no recorded latency.
Summary
Noisy latency readings, smoothed into a trend you can trust.
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