In this topic, we discuss SQL Server Constraints. We first discuss the theory behind them, i.e. the concepts of Data Integrity and Referential Integrity, and Database Normalization. Then we will learn about the types of constraints in SQL with examples, its rules, and syntax. In particular, we will check table constraints. You can learn SQL queries in another article. What are the constraints in SQL? SQL constraints are programmatic constructs that alter the Server’s behavior while [...]