NOT NULL Constraint in SQL Server
Learn how to use the NOT NULL constraint in SQL Server to protect your database integrity! In this beginner-friendly tutorial, we break down what the NOT NULL constraint is, why it is critical for ensuring data accuracy, and exactly how to implement it in your database schemas.
By default, columns in SQL Server can hold NULL (unknown or empty) values. By applying a NOT NULL constraint, you turn that column into a mandatory field, ensuring it always contains valid data.
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