In the school example, the primary key used to identify each member of staff in the teacher table is Staff ID. A foreign key is a primary key from one table that appears in another table to link ...

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.

SQL is neither the fastest nor the most ... For example: CREATE TABLE Orders ( OrderID int NOT NULL PRIMARY KEY, ... PersonID int FOREIGN KEY REFERENCES Persons(PersonID) ); There are longer ...

Across physical tables, shared columns are the evidence of a foreign key relationship. The columns comprising the primary key of the table on the one-side of the relationship are repeated on the table ...