Device Type Serving Most Users

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

Domain

SQL

Difficulty

medium

Seniority

L4

Problem

Which device type serves the most unique users based on session data? If there's a tie, include all tied types. Return the device type and user count.

Summary

One device type serves more users than the rest.

Practice This Problem

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