Notification Delivery Ratio

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

Domain

SQL

Difficulty

medium

Seniority

L3

Problem

Our push notification system logs delivery and open events. What fraction of all sent push notifications were actually opened? Express as a decimal.

Summary

Sent versus delivered. The gap is the problem.

Practice This Problem

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