Biggest Deployment Decline

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

Domain

SQL

Difficulty

medium

Seniority

mid

Problem

A downstream report flagged a drop in one service's deploy frequency. Find which service had the biggest month-over-month drop in deployments from March to April 2026. Only include services that also appear in svc_health. Return just the service with the largest decline, showing the service name and the size of the decline.

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.