SQL Server allows you to define cascading ... All the values that make up the foreign key in the rows that are referenced are set to their default value. All foreign key columns in the related ...

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

but instead of being used for all the FK references, a function or other processing could be defined that verifies a value’s existence. Retaining an infinitude of Foreign Keys may cause future ...