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 needs crash rates before the next rollout decision. For each combination of tag and date, count app opens, count crashes, and compute the crash rate as crashes divided by opens, rounded to 4 decimal places. Only consider open and crash events.
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