By Mario Piattini
An advent to advancements in database platforms layout offered from an functions standpoint. that includes contributions from specialists within the box, it will pay designated awareness to matters raised through new developments in database layout, and the way those advancements impact the programmer and database administrator.
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Extra resources for Advanced Database Technology and Design (Artech House Computer Library)
In the most frequent case, users pose a query, and the system answers it. Both query and answer are in a language understood by the users and by the system. Queries may be extensional (the most frequent case) or intensional. An extensional query asks information about the state of the domain (either the current state or some previous one), and the system gives an extensional or intensional answer. An extensional answer, which is the usual case, consists of more or less elaborated information about the state of the domain.
3 shows an example of relationship type Reads between Person and Book. A particular case of relationship is the reference relationship. In principle, each entity in the domain must have at least one name that allows us to distinguish among entities. A name is a linguistic object that we use to refer to an entity. 2 Entities as instances of concepts. 3 Relationships as instances of concepts. type, that we call lexical entity types. Examples of lexical entity types are String, Number, Bar code, ISBN code.
In users communication, the users tell the system of the events when they occur. For example, when a company changes the price of a product, the system is also notified of the change. 1, an IS may also have an active function. In the active function, the users may delegate to the system the generation of some events that change the state of the domain when some conditions hold. A generated event is an event induced directly by the IS. Without the participation of the system, the event would not be generated, and, therefore, the domain would not change.