Query Processing Concepts and Techniques for Set Containment Tests

Name: Query Processing Concepts and Techniques for Set Containment Tests
Brand: VDM Verlag
SKU: 9783639244397
Price: 27438 HUF
Availability: InStock

Algorithms, algebra, and applications involving the relational division operator

Szerző: Ralf Rantzau

Nyelv:

Kötés: Puha kötésű

Kiadó: VDM Verlag

Elérhetőség: Kiadói készleten rendelésre

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Relational division is an operator of the relational algebra that realizes universal quantifications...

Információk a könyvről

Szerző

Ralf Rantzau

Nyelv

Angol

Kötés

Könyv - Puha kötésű

Kiadva

2010

oldal

232

EAN

9783639244397

ISBN

3639244397

Enbook ID

06832045

Kiadó

VDM Verlag

Súly

345

Méretek

152 x 229 x 13

Teljes leírás

Relational division is an operator of the relational algebra that realizes universal quantifications in queries against a relational database, which can be interpreted as a set containment test. Expressing a universal quantification problem in SQL is cumbersome. Division was introduced by Edgar Codd in 1972 together with other operators of the relational algebra. However, unlike the join operator, for example, it has never been implemented in a commercial relational database system. If the division operator would have a counterpart in a query language, a more intuitive formulation of universal quantification problems would be possible. Although division is a derived operator (like the join operator, it can be expressed using other basic algebra operators) the performance of queries involving a division problem can be significantly increased if it is implemented as a separate operator in a query processor. In this book, we study the set containment test problem and discuss the integration of the division operator into a relational database system. We also present a natural generalization of the division operator which is useful to solve problems like finding frequent itemsets.

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Query Processing Concepts and Techniques for Set Containment Tests

Algorithms, algebra, and applications involving the relational division operator

Információk a könyvről

Teljes leírás

Érdekelheti

Azok a vásárlók, akik ezt a könyvet megvásárolták, a következőket is megvásárolták