Unique Hosts by Node Type

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

Domain

SQL

Difficulty

easy

Seniority

junior

Problem

How many unique hostnames exist across compute, storage, network, and GPU node types? Nodes appearing under multiple types should be counted only once.

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Solve this SQL problem with real code execution. DataDriven runs your SQL queries against a live PostgreSQL database and grades it instantly.