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: 81.44 EUR
Availability: InStock

Algorithms, algebra, and applications involving the relational division operator

Автор: Ralf Rantzau

Език:

Корици: С меки корици

Издател: VDM Verlag

Наличност: Налично при издателя, по поръчка

Изпращаме след 17-27 дни

81.44 € 159.28 лв

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

Информация за книгата

Автор

Ralf Rantzau

Език

Английски език

Корици

Книга - С меки корици

Издадена

2010

страници

232

EAN

9783639244397

ISBN

3639244397

Enbook ID

06832045

Издател

VDM Verlag

Теглоt

345

Размери

152 x 229 x 13

Пълно описание

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.

Може също да ви хареса

Клиенти, които купиха тази книга, купиха също

Най-често търсени

Categories

Authors

Publishers

Продукти

Продукти

Най-често търсени

Categories

Authors

Publishers

Продукти

Продукти

Query Processing Concepts and Techniques for Set Containment Tests

Algorithms, algebra, and applications involving the relational division operator

Информация за книгата

Пълно описание

Може също да ви хареса

Клиенти, които купиха тази книга, купиха също