Loading...
Daily Cross-Platform Users
A easy SQL interview practice problem on DataDriven. Write and execute real sql code with instant grading.
- Domain
- SQL
- Difficulty
- easy
- Seniority
- junior
Problem
The growth team is tracking daily cross-platform engagement for mobile and web users. For each date, count the unique users who had at least one session on a 'mobile' or 'web' device. Show the date and the user count, chronologically.
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.