An interactive study companion for Martin Kleppmann's classic on reliable, scalable, and maintainable systems.

Part 1: Foundations of Data Systems

Part 2: Distributed Data

Part 3: Derived Data

System Design Case Studies

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Designing Data-Intensive Applications

Part 1: Foundations of Data Systems

Ch. 2: Data Models and Query Languages

Relational, document, and graph models — and the query languages that bring them to life.

Relational Model Versus Document Model

Section lesson

Query Languages for Data

Section lesson

Graph-Like Data Models

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Inspired by DDIA by Martin Kleppmann. Independent study companion — not affiliated with O'Reilly.