Daily Cross-Platform Users

An easy 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
easy
Seniority
L3

Interview Prompt

The growth team tracks daily engagement on the big-screen apps: the sessions that ran on a desktop, tablet, or smart TV. For each date, count the unique users who opened at least one such session.

Summary

Mobile and web. Same day, same users?

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