New PDF release: Advances in Computers, Vol. 35

By Marshall C. Yovits

ISBN-10: 0080566677

ISBN-13: 9780080566672

ISBN-10: 0120121352

ISBN-13: 9780120121359

This quantity in a sequence detailing thoughts in all features of laptop technology, is worried with relational databases, tactile details processing and research, object-oriented process improvement equipment; opposite engineering, multiprocessing, foreign computing, and others.

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Extra resources for Advances in Computers, Vol. 35

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The second way of terminating a data flow in a system is by directing the flow to a source or sink. A source or sink is an external user of the information system. For example, in an academic database, a student to whom a note should be sent. Sinks and sources are represented by a rectangle. Figure 5 shows a diagrammatic representation of the components of a data flow diagram. It is possible to construct a variety of levels of the DFD according to the level of abstraction required. This means that an overview diagram can be drawn to get a high abstraction of the system.

Sayani (1 990) describes the changes that have taken place in the PSL/PSA system since its initial version. As is indicated by the name, PSL/PSA consists of two main components. By using PSL a human analyzer states the requirements of the system. The language is designed to allow the specification at any level of detail, and the requirements are recorded in a machine-readable form in a requirements specification database. In a second step, PSA has access to this, and it can be updated, modified, analyzed and used to generate standard reports.

First Name) in ..................... , and enrolled in the (city, Town) course ................. (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.

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