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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

Advanced SQL Toolkit5

SQL syntax cheat sheet
PostgreSQL cheat sheet
MySQL & MariaDB cheat sheet
NoSQL cheat sheet: MongoDB and Redis

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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

Advanced SQL Toolkit5

SQL syntax cheat sheet
PostgreSQL cheat sheet
MySQL & MariaDB cheat sheet
NoSQL cheat sheet: MongoDB and Redis

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NoSQL cheat sheet: MongoDB and Redis

MongoDB CRUD and the aggregation pipeline mapped directly to SQL, plus Redis's core data structures and the cache-aside pattern - a quick reference.

8 min readUpdated 2026-09-04mongodbredisnosqlcheat-sheetreference