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 ...

By using cascading referential integrity constraints, you can define the actions that SQL Server 2005 takes when a user tries to delete or update a key to which existing foreign keys point.

A foreign key is a relationship between two entities. Generally speaking, inter-entity relationships are one-to-many, e.g., an ORDER has many ORDER LINEs, and so forth. Even a case that may start out ...

“Foreign key support has been a longstanding feature request from day ... “We know that today a lot of web development is being done in JavaScripts and you can always use a SQL database together with ...

In SQL 7 you need an OrderDetailID as the Primary Key to uniquely identify each row in the table. In addition you have the OrderID field which serves as the Foreign Key to the Orders table. This lets ...