For each user, show their username and a list of distinct product categories they have purchased as

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

Domain

SQL

Difficulty

medium

Problem

For each user, show their username and a list of distinct product categories they have purchased as unique_categories.

Practice This Problem

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