SQL Server 2000 has a scalar data-type system that defines data types such as int or float, which DBAs commonly think of as "primitives" because they contain values that you can't break down further into components. However, SQL Server 2000 doesn't provide a practical way to extend this type system. When you extend a type, you add new types to it that let you work with more complex values. You might wonder why you'd want to extend a data type such as int, and in SQL Server 2000, you wouldn't. In...