Isbn: 9783540549192 - the problem of incomplete information in relational databases: 554 (13 risultati)

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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.…

Taschenbuch. Condizione: Neu. Druck auf Anfrage Neuware - Printed after ordering - 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.…

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.…

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.…

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.…

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 Print on Demand. …