Understanding SQL Server Constraints

Database constraints provide you with a way to enforce business logic within your database. In this series of articles, we explore the constraints available to you within Microsoft SQL Server.

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• Introduction to SQL Server Constraints
• DEFAULT Constraints in SQL Server
• UNIQUE Constraints in SQL Server
• CHECK Constraints in SQL Server
• NOT NULL Constraints in SQL Server
• PRIMARY KEY Constraints in SQL Server
• FOREIGN KEY Constraints in SQL Server