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SQL Keys and Constraints Explained | Primary, Foreign, Unique, Check, Not Null
Автор: Learn with Sourav
Загружено: 2025-09-22
Просмотров: 25
Описание:
In this video, we explain SQL Keys and Constraints with clear examples. Learn about Primary Key, Foreign Key, Unique Key, Composite Key, and Alternate Key along with important constraints like NOT NULL, CHECK, DEFAULT, and INDEX. Perfect for beginners, students, and interview preparation.
✨ What you’ll learn:
What are SQL Keys and why they are important
Types of SQL Keys (Primary, Foreign, Composite, Alternate, Candidate)
Common SQL Constraints (NOT NULL, UNIQUE, CHECK, DEFAULT, PRIMARY KEY, FOREIGN KEY)
Real examples using Student and Department tables
How constraints ensure data accuracy and integrity
#coding #sql #tutorial
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