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Top Buyers by Transaction Count
A medium SQL interview practice problem on DataDriven. Write and execute real sql code with instant grading.
- Domain
- SQL
- Difficulty
- medium
- Seniority
- mid
Problem
Rank users by the number of transactions they have completed, using a dense ranking so that users with equal counts share the same rank. Return the username, transaction count, and rank for users in the top 5 tiers.
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.