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

junior

Problem

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

Practice This Problem

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