Count the number of transactions each user has made, including users with zero transactions

A medium SQL interview practice problem on DataDriven. Write and execute real sql code with instant grading.

Domain

SQL

Difficulty

medium

Problem

Count the number of transactions each user has made, including users with zero transactions. Return username and the count aliased as transaction_count. Order by transaction_count descending, then username ascending.

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Solve this SQL problem with real code execution. DataDriven runs your SQL queries against a real database and grades it automatically.