The Screens They Carry

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 is profiling how the 25-34 age cohort spreads its usage across hardware. Count the unique devices these users touch, broken down by device type.

Summary

One age cohort, and every kind of screen it reaches for.

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