The Notification Lifecycle

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

Domain

SQL

Difficulty

medium

Seniority

L4

Problem

Our push notification system logs delivery outcomes per user. For registered users only, pivot their notification counts into separate columns for delivered, opened, and failed. Return user ID and the three counts.

Summary

Sent, opened, ignored. What happened after the alert went out?

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