NOT NULL Constraint

# Mastering the Not Null Constraint in SQL: A Comprehensive Guide Have you ever wondered how to ensure the integrity of your database, guaranteeing that essential information is always present? The `Not Null` constraint in SQL is your answer. This fundamental concept prevents columns from containing missing or unknown values (NULLs), ensuring data consistency and reliability. In this comprehensive guide, you'll learn everything you need to know about the `Not Null` constraint, from its basic