Read e-book online A Guided Tour of Relational Databases and Beyond PDF

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

ISBN-10: 0857293494

ISBN-13: 9780857293497

ISBN-10: 1852330082

ISBN-13: 9781852330088

Database thought is now in a mature country, and this e-book addresses vital extensions of the relational database version equivalent to deductive, temporal and object-oriented databases. It offers an summary of database modelling with the Entity-Relationship (ER) version and the relational version delivering the pivot on which the fabric revolves. the most physique of the booklet specializes in the first achievements of relational database idea, together with question languages, integrity constraints, database layout, comput capable queries and concurrency keep an eye on. crucial extensions of the relational version are lined in separate chapters. This booklet can be valuable to 3rd yr laptop technological know-how undergraduates and postgraduates learning database concept, and also will be of curiosity to researchers and database practitioners who wish to recognize extra concerning the principles underlying relational dat abase administration platforms and the issues that confront database researchers.

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A closed formula is also called a sentence. As in the propositional calculus we would like to assign a unique truth-value to any formula F of predicate calculus. However, this task here is much more complicated. The technical details for this can be found, for example, in one of the books we recommend at the end of this subsection. 5; it is a special case of the more general notion of an interpretation. 1 (Structure) A structure is a pair A = ([Aj, F), where [Aj is any nonempty set, called the universe of A, and F is a function whose domain consists of predicate and function symbols.

In addition, if¢ is an isomorphism of Dwith itself, then¢ is called an automorphism. Thus each automorphism, say a, of D is a permutation of the node set, say V, of D, which preserves adjacency. v Given two relations RJ and R2, the composition of R, and R2, symbolised by R2oR" is given by R20R, = {(x, y) I there exists z with (x, z) E R, and (z, y) E R2} . Correspondingly, the composition of two functions f and g, gof, or simply gf, is also a function. We say that this function exists if ran(f) ~ dom(g).

The name of the operation and its parameters. For example, in order to call the above-mentioned operations over EMPLOYEE, the user will need as a parameter the record identity of the employee object involved. Encapsulation means that users can access an object only through its interface, with all implementation information of these operations being hidden. Thus encapsulation provides a form of data independence, since the implementation of an operation can be changed without affecting the way users call the operation.

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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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