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Exclusive Users per Device Type
A medium SQL interview practice problem on DataDriven. Write and execute real sql code with instant grading.
- Domain
- SQL
- Difficulty
- medium
- Seniority
- mid
Problem
For each device type, count users who have only ever used that single device type across all their sessions. Return the device type and exclusive 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.