A Backend Developer's Guide to Databases using PostgreSQL
A Backend Developer's Guide to Databases: From Theory to Practice with PostgreSQL Welcome! If you're a backend developer, you know that databases are not just a part of the job; they're the bedrock of almost every application you'll build. Understanding how to interact with them efficiently is crucial. This guide will walk you through the essential concepts, from the fundamentals to designing and querying a real-world database using PostgreSQL. Why Do We Need Databases Anyway? At its core, a database is a system for persisting information . Persistence means storing data so it survives even after the program that created it stops running. Think about a simple to-do list app. You add tasks, check them off, and when you close and reopen the app, you expect everything to be exactly as you left it. Without persistence, you'd have to start from scratch every single time. That's the magic of a database: it remembers. The Heart of the Matter: Disk-Based vs. In-Memory I...