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from such a design is not very transparent . All possible constraints except the primary key are included in the domain . Operations allowed on EmployeeDomain values are not commonly known; the author of the domain has to explain them to the public . The number of operations that the creator of the domain has to define can rise substantially with the complexity . Remember, you usually don t know who the users of the domain are going to be . It is quite possible that the constraints will not be acceptable to all of them . You don t want to implement such a high level of encapsulation . Clearly, the second design is more practical to use . You realize that simple domains are preferable for relational database design . But why do you call built-in types such as integers simple Well, that s because it is simple for you to deal with values of those types . From school, you know which operations are allowed with integer types, how the operations are named, and how they should be implemented . You don t have to learn new concepts to handle integers . The producers of database management systems are implementing standard definitions . This is why you regard built-in types as simple . Even a small deviation from commonly accepted concepts, such as SQL Server s DATETIME data types, involves complexities that you have to learn and deal with . That s the main reason why the second design of a relation is preferable (the design with simple domains, where propositions are more transparent to read . You can build constraints in many different places:

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Now return to this chapter s rst example. As a mathematical object, fromUSA is a function. It takes one input value (an employee e) and yields (more precisely, associates to that value) a unique output from the set {true, false} of logical truth values. In mathematics, function doesn t belong to a well-de ned category, nor does the more speci c functions of one variable that return truth values as output. To work with functions mathematically, we need to be precise about the function s domain. Because notions such as employee simply fail to admit a well-de ned universal set of any reasonable description, we choose properties or surrogates that work. We may not be able to describe all employees, but we can decide that employees, when we need to refer to them in questions or assertions of fact, must be identi ed unambiguously by a speci c group of properties (such as the combination of name, phone number, and birth date) or by an identi er of some kind. We can then de ne the universal domain of employees as the universe of such identi ers. Once we specify a domain for employees (or values that represent employees), we can be precise about what kind of mathematical object handled is: a Boolean-valued function of one variable, with domain the set of employee identi ers. Whether we choose to represent an object by a surrogate, as we might represent an order by an order number, or by one or more properties, as we might represent a person by birth date and some DNA measurements, we expect the surrogate to represent the object faithfully.

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