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SQL & Databases

Database Foundations4

SQL Fundamentals5

Joins & Aggregation5

Design & Normalization4

Transactions & Performance4

PostgreSQL Deep Dive4

MySQL & MariaDB4

NoSQL & Choosing the Right Database5

Why NoSQL exists - the limits of the relational model
The four types of NoSQL databases
MongoDB hands-on: your first document database
Redis hands-on: caching and beyond
Choosing the right database: a complete decision framework

Advanced SQL Toolkit5

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SQL & Databases

Database Foundations4

SQL Fundamentals5

Joins & Aggregation5

Design & Normalization4

Transactions & Performance4

PostgreSQL Deep Dive4

MySQL & MariaDB4

NoSQL & Choosing the Right Database5

Why NoSQL exists - the limits of the relational model
The four types of NoSQL databases
MongoDB hands-on: your first document database
Redis hands-on: caching and beyond
Choosing the right database: a complete decision framework

Advanced SQL Toolkit5

Learn SQL & Databases NoSQL & Choosing the Right Database

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Why NoSQL exists - the limits of the relational model

CAP theorem, horizontal scaling, and the real problems that pushed some systems away from strict relational tables.

12 min readUpdated 2026-09-04nosqlcap-theoremdistributed-systemsdatabase-systems