DataDriven
LearnPracticeInterviewDiscussDailyJobs

Exclusive Users per Device Type

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
L4

Interview Prompt

For each device type, count users who have only ever used that single device type across all their sessions. Return the device type and exclusive user count.

Summary

Loyal to one platform only.

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

Related

  • All Mock Interviews
  • Practice Mode (untimed)
  • SQL Interview Questions
  • Data Engineering Interview Prep Guide
  • Practice Problems
  • Daily Challenge