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: 77.43 EUR
Availability: InStock

Algorithms, algebra, and applications involving the relational division operator

Autor: Ralf Rantzau

Jazyk:

Väzba: Brožovaná

Vydavateľ: VDM Verlag

Dostupnosť: U vydavateľa na objednávku

Odosielame za 17-27 dní

77.43 €

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

Informácie o knihe

Autor

Ralf Rantzau

Jazyk

Angličtina

Väzba

Kniha - Brožovaná

Vydalo

2010

Stránok

232

EAN

9783639244397

ISBN

3639244397

Enbook ID

06832045

Vydavateľ

VDM Verlag

Hmotnosť

345

Rozmery

152 x 229 x 13

Kompletný popis

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

Informácie o knihe

Kompletný popis

Mohlo by vás zaujímať

Zákazníci, ktorí si kúpili túto knihu, kúpili tiež