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Book Cover
E-book
Author Flesca, Sergio, 1971-

Title Repairing and querying databases under aggregate constraints / Sergio Flesca, Filippo Furfaro, Francesco Parisi
Published New York, NY : Springer, ©2011

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Description 1 online resource (viii, 61 pages)
Series SpringerBriefs in computer science, 2191-5768
SpringerBriefs in computer science.
Contents Introduction -- Preliminaries -- Repairing and Querying: the Fundamental Decision Problems -- Computing Card-minimal Repairs -- Consistent Answers to Aggregate Queries -- Possible Extensions and Open Problems -- References
Summary Research has deeply investigated several issues related to the use of integrity constraints on relational databases. In particular, a great deal of attention has been devoted to the problem of extracting "reliable" information from databases containing pieces of information inconsistent with regard to some integrity constraints. In this manuscript, the problem of extracting consistent information from relational databases violating integrity constraints on numerical data is addressed. Aggregate constraints defined as linear inequalities on aggregate-sum queries on input data are considered. The notion of repair as consistent set of updates at attribute-value level is exploited, and the characterization of several data-complexity issues related to repairing data and computing consistent query answers is provided. Moreover, a method for computing?reasonable? repairs of inconsistent numerical databases is introduced, for a restricted but expressive class of aggregate constraints. An extension of this method for dealing with the data repairing problem in the presence of weak aggregate constraints which are expected to be satisfied, but not required to, is presented. Furthermore, a technique for computing consistent answers of aggregate queries in the presence of a wide form of aggregate constraints is provided. Finally, extensions of the framework as well as several open problems are discussed
Analysis computerwetenschappen
computer sciences
databasebeheer
database management
Information and Communication Technology (General)
Informatie- en communicatietechnologie (algemeen)
Bibliography Includes bibliographical references
Notes Online resource; title from PDF title page (EBSCO, viewed January 10, 2018)
Subject Database management.
Relational databases.
COMPUTERS -- Databases -- General.
Database management
Relational databases
Form Electronic book
Author Furfaro, Filippo
Parisi, Francesco
ISBN 9781461416418
1461416418