Get Advances in Computers, Vol. 35 PDF

By Marshall C. Yovits

ISBN-10: 0080566677

ISBN-13: 9780080566672

ISBN-10: 0120121352

ISBN-13: 9780120121359

This quantity in a sequence detailing techniques in all facets of machine technological know-how, is worried with relational databases, tactile info processing and research, object-oriented method improvement equipment; opposite engineering, multiprocessing, overseas computing, and others.

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By not using the concept of a subclass, the fact that a student is either a graduate or an undergraduate student has to be represented by using an additional attribute in the entity type Student. Moreover, by not using subclasses we would preclude the possibility to represent the fact that only graduate students have an instance of Faculty as their advisor. An entity cannot exist in the database by only being a member of a subclass and without being member of the superclass. Fundamental to the class concept is the concept of attribute inheritance.

Course Number) on . /. /19. . has passed it with ............... (Letter Grade) DESIGN OF RELATIONAL DATABASES 21 Parametric text may indicate the existence of certain attributes and their domains. From the example, attributes FirstName, Last-Name, Place and Date-of-Birth of an entity type Student can be derived. Structured text such as . /. /19. g. six bytes required), which will become useful in subsequent phases of design. Moreover, parametric text may indicate a relationship between certain entity types.

PERNUL will have the capacity to directly implement a database described by a highlevel conceptual schema. The ER model, introduced by Chen (1976), has found wide acceptance in database design with respect to theory as well as practice. A conference devoted to the dissemination of research related to the ER model, its extensions, implementations of tools and the use of the ER model in design has been held regularly since 1979. The ER model provides the designer with three semantic concepts : entities, relationships and attributes.

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Advances in Computers, Vol. 35 by Marshall C. Yovits

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