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Service Uptime Minutes

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
senior

Interview Prompt

Given a devices table and an event_data table logging ON/OFF status changes with timestamps, write a query to calculate total powered-on minutes per device. An ON followed by an OFF is one uptime window. Only consider the first year after each device's activation date.

How This Interview Works

  1. Read the vague prompt (just like a real interview)
  2. Ask clarifying questions to the AI interviewer
  3. Write your sql solution with real code execution
  4. Get instant feedback and a hire/no-hire decision