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Frequent Message Senders
A medium SQL interview practice problem on DataDriven. Write and execute real sql code with instant grading.
- Domain
- SQL
- Difficulty
- medium
- Seniority
- junior
Problem
Surface all sender IDs who have posted more than one message, along with each sender's message count. A downstream anomaly-detection system needs these high-frequency senders.
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.