Count the number of transactions each user has made

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. Show user_id and the count labeled as num_transactions, grouped by user_id.

Practice This Problem

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