7-Check Rolling Average
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
The platform reliability team monitors latency trends per service. For each service, compute a rolling average of latency across the current health check and the 6 checks immediately before it, ordered by check time. Return the service name, check timestamp, raw latency, and the rolling average.
Summary
Seven entries hold the trend.
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