The Ones Still Listening

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

Domain

SQL

Difficulty

medium

Seniority

L3

Problem

The engagement team is measuring notification effectiveness for the quarterly product review. Compute the percentage of all push notifications that were both sent to a user with an active account and opened by the recipient. Notifications should still be counted in the denominator even if the user's account record no longer exists.

Summary

A buzz only counts when someone who is still around answers it.

Practice This Problem

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