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The personnel department above may not consider consultants but may keep data on retired people, who are paid by an outside pension plan Now the payroll view is no longer a proper subset of the personnel view, although their overlap is great

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If two key domains overlap, a new general relation Rg will be created D(R1 A) D(R2 A) D(Rg A) Rg Rg

Solution to Question 11-1. This relationship between specialization and generalization is reciprocal: if you have three types with similar functionality, you can factor that similarity out of the three types into a generalized type. At the same time, the three types are now specialized forms of the more generalized type. Inheritance is also implicitly hierarchical: you can imagine a tree with the most generalized type at the top and each level of specialization descending from levels above. A generalized type may have many specializations, but each specialized type may have only one generalization. Solution to Question 11-2. In C#, the principle of specialization is implemented through inheritance. Solution to Question 11-3. The syntax for inheritance is:

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Solution to Question 11-4. To implement polymorphism, you create a virtual method in the base class, and then override it in the derived class. Solution to Question 11-5. The more usual meaning of new is to allocate memory on the heap. The special meaning in inheritance is that you are not overriding a base method; you are creating a new method that intentionally hides and replaces the base class method. Solution to Question 11-6. To call a base class constructor from a derived class, after the parameter list but before the opening brace put a colon followed by the keyword base and two parentheses. Pass the parameters for the base class constructor within the parentheses. Solution to Question 11-7. An abstract method has no implementation in the base class, but must be overridden and implemented in any derived class that does not itself want to be abstract. Any class with an abstract method (even if inherited) is itself abstract and may not be instantiated. Solution to Question 11-8. A sealed class is one that the compiler will not let you derive from. Classes are marked sealed when the designer of the class does not want anyone to create a derived version.

The general relation contains all common data Subrelations will be retained to hold instances and data particular to the subgroups The general relation is the one to be used for general queries, where presence of special categories, here consultants and retirees, could bias the results

Solution to Question 11-9. The base class of Int32, and all types in C#, is Object. Solution to Question 11-10. If you don t specifically define a base class for your userdefined class, the default base class is Object.

Solution to Exercise 11-1. Create a base class, Telephone, and derive a class ElectronicPhone from it. In Telephone, create a protected string member phonetype and a public method Ring( ) which outputs a text message such as this: Ringing the <phonetype>. In ElectronicPhone, the constructor should set the phonetype to Digital. In the Run( ) method, call Ring( ) on the ElectronicPhone to test the inheritance. This exercise isn t too tricky; you simply need to define the base class (Telephone) with a constructor, a single member variable (phonetype), and a single method (Ring( )). Then derive the new class ElectronicPhone using the appropriate syntax, and create a constructor that sets phonetype accordingly. You don t need to override the Ring( ) method, because there s no functionality to add to the base class method. Example A-26 shows one solution.

Adaptation of generalizable relations Even when ruling-part domains do not overlap, the entities may be generalizable These cases are recognized by nding relation-schemas that are similar Trucks, vans, and cars are generalizable to vehicles, and this generalization is useful because similar data are kept on all of them They also share as ruling part the attribute license number

Example A-26. One solution to Exercise 11-1

We merged in the earlier steps relations based on compatibility of entities Often this required the creation of subrelations Now all the relations have been established We now assign dependent attributes to the most general relation possible If the original relations have dependent-part attributes that do not correspond to attributes within the general relation, these attributes have to be managed distinctly The two approaches used earlier are feasible: changing the domains obtained from the views by augmenting the domains

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using using using using System; System.Collections.Generic; System.Linq; System.Text;

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