First Touch Attribution

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

Domain

SQL

Difficulty

medium

Seniority

junior

Problem

For each user, surface the channel from their earliest recorded event, since that channel gets credit for the acquisition. Return the user_id and that channel name.

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.