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
Your team is investigating whether certain API endpoints are getting slower over time. For every row in api_calls where latency is not NULL, compute a running average of latency partitioned by endpoint and ordered by call_time, covering all calls up to and including the current one. Return endpoint, latency, and running_avg.
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