Sinossi
In a relational database the information is recorded as rowsin tables. However, in many practical situations theavailable information is incomplete and the values for somecolumns are missing. Yet few existing database managementsystems allow the user to enter null values in the database.This monograph analyses the problems raised by allowing nullvalues in relational databases. The analysis coverssemantical, syntactical, and computational aspects.Algorithms for query evaluation, dependency enforcement andupdates in the presence of null values are also given.The analysis of the computational complexity of thealgorithms suggests that from a practical point of view thedatabase should be stored as Horn tables, which aregeneralizations of ordinary relations, allowing null valuesand Horn clause-like restrictions on these null values. Horntables efficiently support a large class of queries,dependencies and updates.
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Contenuti
Relational databases.- Semantic aspects of incomplete information.- Syntactic and algorithmic aspects of incomplete information.- Computational complexity aspects of incomplete information.- Some conclusive aspects.
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The Problem of Incomplete Information in Relational Databases (Lecture Notes in Computer Science)
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The Problem of Incomplete Information in Relational Databases
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Softcover. Condizione: Bon. Ancien livre de bibliothèque. Légères traces d'usure sur la couverture. Edition 1991. Ammareal reverse jusqu'à 15% du prix net de cet article à des organisations caritatives. ENGLISH DESCRIPTION Book Condition: Used, Good. Former library book. Slight signs of wear on the cover. Edition 1991. Ammareal gives back up to 15% of this item's net price to charity organizations. Codice articolo E-583-027
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The Problem of Incomplete Information in Relational Databases (Lecture Notes in Computer Science, 554)
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The Problem of Incomplete Information in Relational Databases
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Springer Berlin Heidelberg, Springer Nov 1991, 1991
ISBN 10: 3540549196
ISBN 13: 9783540549192
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Taschenbuch. Condizione: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -In a relational database the information is recorded as rowsin tables. However, in many practical situations theavailable information is incomplete and the values for somecolumns are missing. Yet few existing database managementsystems allow the user to enter null values in the database.This monograph analyses the problems raised by allowing nullvalues in relational databases. The analysis coverssemantical, syntactical, and computational aspects.Algorithms for query evaluation, dependency enforcement andupdates in the presence of null values are also given.The analysis of the computational complexity of thealgorithms suggests that from a practical point of view thedatabase should be stored as Horn tables, which aregeneralizations of ordinary relations, allowing null valuesand Horn clause-like restrictions on these null values. Horntables efficiently support a large class of queries,dependencies and updates. 172 pp. Englisch. Codice articolo 9783540549192
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Condizione: New. Dieser Artikel ist ein Print on Demand Artikel und wird nach Ihrer Bestellung fuer Sie gedruckt. In a relational database the information is recorded as rowsin tables. However, in many practical situations theavailable information is incomplete and the values for somecolumns are missing. Yet few existing database managementsystems allow. Codice articolo 4893372
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The Problem of Incomplete Information in Relational Databases
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ISBN 10: 3540549196
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Taschenbuch. Condizione: Neu. This item is printed on demand - Print on Demand Titel. Neuware -A null value in a relational database represents missing information. This monograph analyses the problems raised by allowing null values in relational databases. Semantical, syntactical, and computational aspects are covered.Springer-Verlag KG, Sachsenplatz 4-6, 1201 Wien 172 pp. Englisch. Codice articolo 9783540549192
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Condizione: Sehr gut. Zustand: Sehr gut | Sprache: Englisch | Produktart: Bücher | In a relational database the information is recorded as rowsin tables. However, in many practical situations theavailable information is incomplete and the values for somecolumns are missing. Yet few existing database managementsystems allow the user to enter null values in the database.This monograph analyses the problems raised by allowing nullvalues in relational databases. The analysis coverssemantical, syntactical, and computational aspects.Algorithms for query evaluation, dependency enforcement andupdates in the presence of null values are also given.The analysis of the computational complexity of thealgorithms suggests that from a practical point of view thedatabase should be stored as Horn tables, which aregeneralizations of ordinary relations, allowing null valuesand Horn clause-like restrictions on these null values. Horntables efficiently support a large class of queries,dependencies and updates. Codice articolo 341594/2
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Taschenbuch. Condizione: Neu. Druck auf Anfrage Neuware - Printed after ordering - In a relational database the information is recorded as rowsin tables. However, in many practical situations theavailable information is incomplete and the values for somecolumns are missing. Yet few existing database managementsystems allow the user to enter null values in the database.This monograph analyses the problems raised by allowing nullvalues in relational databases. The analysis coverssemantical, syntactical, and computational aspects.Algorithms for query evaluation, dependency enforcement andupdates in the presence of null values are also given.The analysis of the computational complexity of thealgorithms suggests that from a practical point of view thedatabase should be stored as Horn tables, which aregeneralizations of ordinary relations, allowing null valuesand Horn clause-like restrictions on these null values. Horntables efficiently support a large class of queriesdependencies and updates. Codice articolo 9783540549192
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Taschenbuch. Condizione: Neu. The Problem of Incomplete Information in Relational Databases | Gösta Grahne | Taschenbuch | viii | Englisch | 1991 | Springer | EAN 9783540549192 | Verantwortliche Person für die EU: Springer Verlag GmbH, Tiergartenstr. 17, 69121 Heidelberg, juergen[dot]hartmann[at]springer[dot]com | Anbieter: preigu. Codice articolo 102135904
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