New PDF release: A Guided Tour of Relational Databases and Beyond

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 akin to deductive, temporal and object-oriented databases. It presents 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 publication makes a speciality of the first achievements of relational database idea, together with question languages, integrity constraints, database layout, comput capable queries and concurrency regulate. crucial extensions of the relational version are coated in separate chapters. This e-book should be worthy to 3rd yr computing device technology undergraduates and postgraduates learning database thought, 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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Additional info for A Guided Tour of Relational Databases and Beyond

Example text

The objects collected into the set are then called its members, or elements, and membership is designated by the symbol E or simply in. Thus "a is a member of the set X" or "a is in the set X" is written a E X or a in X. The members of a set are enclosed by { (begin) and} (end) and ',' (comma) is used as a separator. A set does not contain any duplicates. A relaxation of this condition results in a more general notion of a set which may contain duplicates; such a generalised set is called a multiset.

6 has a single key which is the relation-valued attribute (X-COORD, Y-COORD)*. The flat relation shown 22 Chapter 1. 7 resulting from unnesting this shallow relation does not preserve the two key values. The keying operator [JS82] is an operator which adds a new key to the relation schema of a nested relation and maintains a key value for each nested tuple in the nested relation being keyed. 9. 6. 8 Ashallow relation obtained by UNNEST and NEST I AREA I I (X-COORD Y-COORD)* 0 1 0 2 0 0 0 2 0 II II II The relational calculus and SQL have also been extended to nested relations.

Post and A. Markov. We begin with "machines" that are less powerful than a Turing machine in terms of the computations they can perform. We then incrementally look at more powerful machines leading to the Turing machine. A deterministic finite automaton consists of an input tape, which is divided into squares, and a black box, called finite control. 10). Initially, the head is placed at the leftmost square of the tape and the finite control is set in a designated initial state. At regular intervals the automaton reads one symbol from the input tape and then enters a new state depending on the current state and the symbol just read.

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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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