First Deploy Attribution

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

Domain

SQL

Difficulty

medium

Seniority

mid

Problem

The release engineering team wants to measure onboarding velocity: how often are engineers deploying to a service for the very first time? For each service, show the total deployment count alongside how many of those were an author's first-ever deployment to that service.

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.