Session Overview

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
L4

Interview Prompt

The product team wants a per-user report from `users` and `user_sessions`: each user's `user_id` and `username` next to how many sessions they have and their longest `session_duration_sec`.

Summary

Full engagement picture, even for the ones who never showed up.

How This Interview Works

  1. Read the vague prompt (just like a real interview)
  2. Ask clarifying questions to the AI interviewer
  3. Write and run your SQL against a real database
  4. Answer the interviewer's follow-up questions, then get a hire or no-hire decision