The Screens They Carry

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

Domain

SQL

Difficulty

medium

Seniority

L4

Problem

The product team is profiling how the 25-34 age cohort spreads its usage across hardware. Count the unique devices they use, broken down by device type, from most to fewest.

Summary

One age cohort, and every kind of screen it reaches for.

Practice This Problem

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