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What is Database Constraints

Chapter 10
Handbook of Research on Innovations in Database Technologies and Applications: Current and Future Trends
Boolean functions associated with elements of a database being used to evaluate the integrity of actions or data that are inserted, removed or updated. A Database Constraint can be defined as a set of predicates P1 ?P2 ?... ?Pk, where each predicate possesses the form C1?C2, and where C1 is an attribute, ? is a comparison operator and C2 is either an attribute or a constant (Camolesi, 2004). The specification of a database constraint can be formalized using the Object Constraint Language – OCL (Object Management Group)
Published in Chapter:
Database Engineering Supporting the Data Evolution
Luiz Camolesi Júnior (State University of Campinas (UNICAMP), Brazil) and Marina Teresa Pires Vieira (Methodist University of Piracicaba – UNIMEP, Brazil)
Copyright: © 2009 |Pages: 9
DOI: 10.4018/978-1-60566-242-8.ch010
Abstract
Researchers in several areas (sociology, philosophy and psychology), among them Herbert Spencer and Abraham Maslow, attribute human actions resulting in continual environmental changes to the search for the satisfaction of individual and collective needs. In other fields of science, this behavior represents a challenge in ethical researches on concepts, methodologies and technologies aimed at optimizing and qualifying the actions involved in these continual changes to obtain better results.
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