Sequential Service Transitions

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

Domain

SQL

Difficulty

hard

Seniority

senior

Problem

Among all users who deployed to 'auth-svc' at some point, how many had 'payments-svc' as their very next deployment (by timestamp) with no other services in between? Return a single count.

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.