Real-world relational databases have tables that contain fields, constraints, and triggers, and tables are related through foreign keys. SQL is used to declare the data to be returned, and a SQL ...

these relationships are defined through FOREIGN KEY constraints. (Here’s more information on defining SQL Server constraints.) The code below defines a relationship between the SalesHistory and ...

A foreign key is a relationship between two entities ... by the exclusion of these Start Date columns is that the development team saves a few lines of code and a little bit of effort. Now, of course, ...