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Flesca, Sergio, Parisi, Francesco, Furfaro, Filippo - Repairing and Querying Databases under Aggregate Constraints
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Schrijver: | Flesca, Sergio, Parisi, Francesco, Furfaro, Filippo |
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Titel: | Repairing and Querying Databases under Aggregate Constraints |
ISBN: | 9781461416401 |
Uitgever: | Springer US |
Bijzonderheid: | 2011 72pp Paperback / softback |
Prijs: |
€ 50,10
Gratis
|
Meer info | Annotatie 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 Flaptekst 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 |
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