App Stability by Region
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
- 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.
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 and run your SQL against a real database
- Answer the interviewer's follow-up questions, then get a hire or no-hire decision