Running Node Pairs

An easy SQL mock interview question on DataDriven, with an AI interviewer who asks follow-up questions and a hire or no-hire decision at the end.

Domain

SQL

Difficulty

easy

Seniority

L4

Interview Prompt

A data-center team planning failover coverage wants to know which hosts are up together in the same region. Return every unique pair of hostnames that both have a running node in the same region, listing the alphabetically-earlier hostname first.

Summary

Two servers, same region, both alive.

How This Interview Works

1. Read the vague prompt (just like a real interview)
2. Ask clarifying questions to the AI interviewer
3. Write and run your SQL against a real database
4. Answer the interviewer's follow-up questions, then get a hire or no-hire decision