By Mark Levene BSc, PhD, George Loizou BA, PhD (auth.)

ISBN-10: 0857293494

ISBN-13: 9780857293497

ISBN-10: 1852330082

ISBN-13: 9781852330088

Database idea is now in a mature country, and this ebook addresses very important extensions of the relational database version reminiscent of deductive, temporal and object-oriented databases. It offers an summary of database modelling with the Entity-Relationship (ER) version and the relational version supplying the pivot on which the cloth revolves. the most physique of the e-book specializes in the first achievements of relational database thought, together with question languages, integrity constraints, database layout, comput capable queries and concurrency keep an eye on. an important extensions of the relational version are coated in separate chapters. This ebook might be precious to 3rd 12 months desktop technological know-how undergraduates and postgraduates learning database concept, and also will be of curiosity to researchers and database practitioners who want to be aware of extra concerning the principles underlying relational dat abase administration structures and the issues that confront database researchers.

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The said principle is a very powerful principle and can be used to form a great variety of sets. However, too full an interpretation of the word "property" gives rise to contradictions such as "Russell's Paradox". For example, consider the set {x I x ~ x}. We next define the principal relations between sets and operations thereon. Subset: We write X ~ Y (or Y ;2 X) to mean that any member of X is also a member of Y, and say that X is a subset of Y, or that X is contained in Y. Alternatively, we say that Y is a superset of X.

Firstly, it may not be effective or even possible to optimise general programs, written in a computationally complete database programming language, while there are well-known algorithms available for optimising relational algebra queries [KRB85, UllS9]. Secondly, users should be allowed to ask the database system simple 28 Chapter 1. Introduction queries by using a relatively simple query language such as SQL. This has given rise to several research projects aimed at implementing ad hoc query languages for object -oriented databases.

10 which models a family tree (this relation may be better modelled via a nested relation). The following nonrecursive rule finds the grandparents relation: The following nonrecursive rule finds the sibling relation, assuming that a person is a sibling of itself: The following two rules, one of which is recursive, find all the ancestors of people in the database: ANC(Xl, X2):- PAR(Xl , X2). ANC(Xl , X3):- PAR(Xl, X2), ANC(X2, X3). 7. What is a Data Model? 25 The following two rules, one of which is recursive, find all the people in the database which are of the same generation: SAME_GEN(X2 , X3) : - PAR(x" X2), PAR(x" X3) .

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A Guided Tour of Relational Databases and Beyond by Mark Levene BSc, PhD, George Loizou BA, PhD (auth.)

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