Content Recommendation Engine

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

Domain

SQL

Difficulty

medium

Seniority

senior

Problem

For each user, find content items they haven't viewed but at least one of their chat contacts (from chat_msgs) has viewed. Return the user ID and the recommended content ID.

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.