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The Problem of Incomplete Information in Relational Databases
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The Problem of Incomplete Information in Relational Databases (Paperback)

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Synopsis

In a relational database the information is recorded as rows

in tables. However, in many practical situations the

available information is incomplete and the values for some

columns are missing. Yet few existing database management

systems allow the user to enter null values in the database.

This monograph analyses the problems raised by allowing null

values in relational databases. The analysis covers

semantical, syntactical, and computational aspects.

Algorithms for query evaluation, dependency enforcement and

updates in the presence of null values are also given.

The analysis of the computational complexity of the

algorithms suggests that from a practical point of view the

database should be stored as Horn tables, which are

generalizations of ordinary relations, allowing null values

and Horn clause-like restrictions on these null values. Horn

tables efficiently support a large class of queries,

dependencies and updates.

Computing & ITDatabases Publisher: Springer-Verlag Berlin and Heidelberg GmbH & Co. KG Publication Date: 13/11/1991 ISBN-13: 9783540549192  Details: Type: Paperback Format: Books
Availability: Printed to order. Despatched in 2-3 weeks.  

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