🐘 What Is PostgreSQL?
PostgreSQL is a powerful open-source relational database widely used in production applications.
While SQLite is common for development and small projects, PostgreSQL is designed for large, real-world systems.
🗄 What Is an RDBMS?
An RDBMS (Relational Database Management System) stores structured data in tables and manages relationships between them while ensuring performance, reliability, and data integrity.
PostgreSQL is a full-featured RDBMS used in enterprise applications.
🔎 PostgreSQL vs SQLite
🐘 PostgreSQL
Production-ready database
Runs on its own server
Highly scalable and secure
Handles many users and large datasets
📦 SQLite
Serverless database
Stored as a local file
Lightweight and simple
Best for development and small apps
⚙️ Key Differences
Server
PostgreSQL → runs on a database server
SQLite → runs inside the application
Scalability
PostgreSQL → built for high traffic and large systems
SQLite → best for small projects or testing
Security
PostgreSQL → authentication, roles, access control
SQLite → no built-in user authentication
🌍 Who Uses PostgreSQL?
Large companies such as Apple, Reddit, and Twitch use PostgreSQL because of its reliability and scalability.
🛠 What We Will Learn
In this section we will:
1️⃣ Install PostgreSQL (Windows & macOS)
2️⃣ Create tables similar to our SQLite models
3️⃣ Connect PostgreSQL to our FastAPI app
4️⃣ Perform CRUD operations (Create, Read, Update, Delete)
🚀 Moving to Production
After connecting PostgreSQL:
Our app will no longer rely on a local SQLite file
We will use a real production database
Our project moves from development level → production level