App Stability by Region
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
- L5
Interview Prompt
The mobile team is weighing the next rollout and wants to see where the app keeps falling over. Looking only at app opens and crashes, count each for every tag set and event timestamp, and report the crash rate as crashes divided by opens, rounded to four decimal places.
Summary
Some regions crash more than others.
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