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The Session Stitcher

A hard SQL mock interview question on DataDriven. Practice with AI-powered feedback, real code execution, and a hire/no-hire decision.

Domain
SQL
Difficulty
hard
Seniority
senior, staff

Interview Prompt

Given a page_views table with user_id and timestamp, write a query to sessionize the events. A session is a sequence of events where no gap between consecutive events exceeds 30 minutes. Assign a session_id to each event, then compute the average session duration and average pages per session.

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