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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
- mid
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.
Practice This Problem
Solve this SQL problem with real code execution. DataDriven runs your SQL queries against a live PostgreSQL database and grades it instantly.