Notifications Pivot by Weekday

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

Domain

SQL

Difficulty

medium

Seniority

mid, senior

Problem

Build a notification volume breakdown pivoted by platform and day of week, scoped to users enrolled in at least one experiment. Rows should be days of the week (0=Sunday through 6=Saturday), with separate count columns for ios, android, and web. Return the day of week and each platform's count.

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