Advances in Computers, Vol. 35 - download pdf or read online

By Marshall C. Yovits

ISBN-10: 0080566677

ISBN-13: 9780080566672

ISBN-10: 0120121352

ISBN-13: 9780120121359

This quantity in a chain detailing concepts in all facets of desktop technological know-how, is worried with relational databases, tactile info processing and research, object-oriented process improvement equipment; opposite engineering, multiprocessing, foreign computing, and others.

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Integrity constraints are predicates defined on attributes, entities or relationship types. Integrity constraints restrict the set of theoretically possible instances to the set of semantically meaningful instances of attribute values, entities or relationships. Common integrity constraints on the attribute level are restrictions on the domain of attributes, existence conditions of attributes (relate to values present in other entity types), repetition factors of attribute values of entities of the same type and interdependencies between attributes.

For each term the appropriate level of abstraction should be chosen. Instead of using general concepts for attributes, relationship or entity types, specializations should be given. For example, instead of using the synonym place, the specialization city should be used; or instead of referring to date, choose birth date. 2. The use of instances instead of general concepts should be avoided. 3. Avoid redundant expressions and deliberate repetition. 4. Choose a standard syntactic style for sentences.

Files, look-up tables, microfiche or other storage media are examples of possible data stores. An arrow from a data store pointing toward a process indicates that the data store is only referenced by the process and the process will not update or change data in any way. A line from a process to a data store means that the process changes the content of the store. The symbol for a data store is a pair of parallel lines with one end closed. The second way of terminating a data flow in a system is by directing the flow to a source or sink.

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

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