Question 15

Answer E is correct. In this situation, you want to implement cascading operations. To do so, you alter the table definitions and use the CASCADE clause within the implementation of foreign key constraints. DML triggers are not an efficient mechanism for preserving referential integrity, and DDL triggers lack the necessary functionality because they deal with a different set of objects.

For more information, see the following sources:

• Chapter 3, "Implementing Database Objects"

• SQL Server 2005 Books Online: "SQL Server Database Engine, Designing and Creating Databases, Designing Tables, Enforcing Data Integrity, FOREIGN KEY Constraints"

• "INF: Implementing Referential Integrity and Cascading Actions (White Paper)," http://support.microsoft.com/default.aspx?scid=kb;en-us;322323