App Stability by Region

A medium SQL interview practice problem on DataDriven. Write and execute real sql code with instant grading.

Domain

SQL

Difficulty

medium

Seniority

L5

Problem

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.

Practice This Problem

Solve this SQL problem with real code execution. DataDriven runs your SQL queries against a real database and grades it automatically.