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 kingdom, and this publication addresses vital extensions of the relational database version similar to deductive, temporal and object-oriented databases. It offers an outline of database modelling with the Entity-Relationship (ER) version and the relational version supplying the pivot on which the fabric revolves. the most physique of the publication specializes in the first achievements of relational database conception, 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 e-book could be valuable to 3rd yr laptop technology undergraduates and postgraduates learning database idea, and also will be of curiosity to researchers and database practitioners who wish to understand extra in regards to the rules underlying relational dat abase administration structures and the issues that confront database researchers.

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Additional info for A Guided Tour of Relational Databases and Beyond

Sample text

There is no loss of generality in this assumption, since we can always create a new tree type with a new root record type which combines all the record types in the forest type into a single tree type. Moreover, without loss of generality, we assume that the database consists of a single tree record. A hierarchical path (or simply a path) is a sequence of records starting from a root record and following alternately from a parent record to a child record. For example, STUDENT, COURSE, TEACHER is a path.

The fundamental operation of hierarchical navigation is that of traversing tree records by specifying paths starting from a root record to the record we are trying to locate. As in the network model tree traversal is done one record at a time. At each stage when the user is navigating through the database a currency pointer is maintained by the DBMS, which is the record identity of the most recently accessed record. Traversal of a tree record is performed in a depth-first [Tarn, AHU83) manner as follows, starting by making the root record the current record: 1) visit the current record if it has not already been visited, else 2) visit the leftmost child record not previously visited, else 3) go back to the parent record.

V) Nothing is a regular expression unless it follows from (i) through (iv). The class of regular languages (or regular sets) over L is the minimal set of languages containing 0 as well as the singletons {a}, for all a E L, and closed under union, concatenation and Kleene star. It can be shown that a language is regular if and only if it can be described by a regular expression. In addition, a language is regular if and only if it is accepted by a DFA. This fundamental result was proved in a seminal paper by Kleene [Kle56].

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