SQL Constraints Explained | Primary Key, Foreign Key, Unique, Not Null, Check | PostgreSQL скачать в хорошем качестве

SQL Constraints Explained | Primary Key, Foreign Key, Unique, Not Null, Check | PostgreSQL

Welcome to LearnWithMe! In today’s video, we will learn all about SQL Constraints — the rules that keep your database accurate, safe, and reliable. 📌 What Are Constraints? Constraints are rules applied to table columns to ensure valid and consistent data. 📚 Types of Constraints Covered: ✔️ PRIMARY KEY – Uniquely identifies each record ✔️ FOREIGN KEY – Establishes relationship between tables ✔️ UNIQUE – Ensures no duplicate values ✔️ NOT NULL – Column cannot have empty values ✔️ CHECK – Validates data using conditions 🎯 What You Will Learn: • Why constraints are important • How to add constraints while creating tables • Real-world examples of each constraint • Common errors and how to fix them Perfect for beginners learning SQL or preparing for database interviews! If you find this helpful, don’t forget to Like, Share & Subscribe ❤️ #sqlconstraints #postgresql #sqltutorial #database #learnsql #primary