Device Mix
A easy SQL mock interview question on DataDriven. Practice with AI-powered feedback, real code execution, and a hire/no-hire decision.
- Domain
- SQL
- Difficulty
- easy
- Seniority
- L3
Interview Prompt
The product team is deciding whether to invest in a mobile redesign and needs to understand the current device landscape. For each combination of device type and operating system, show how many devices are registered. Only include combinations that have at least three registrations, ordered from most common to least.
Summary
The device breakdown before the redesign.
How This Interview Works
- Read the vague prompt (just like a real interview)
- Ask clarifying questions to the AI interviewer
- Write your sql solution with real code execution
- Get instant feedback and a hire/no-hire decision