Automatically assigned DDC number: 00574

Manually assigned DDC number: 00574

Number of references: 32

Title: Query Answering in Inconsistent Databases

Author:

Author:

Subject: Leopoldo Bertossi,Jan Chomicki Query Answering in Inconsistent Databases

Description: Introduction In this chapter, we address the issue of obtaining consistent information from inconsistent databases -- databases that violate given integrity constraints. Our basic assumption departs from everyday practice of database management systems. Typically, a database management system checks the satisfaction of integrity constraints and backs out those updates that violate them. However, present-day database applications have to consider a variety of scenarios in which data is not necessarily consistent: Integration of autonomous data sources. The sources may separately satisfy the constraints, but when they are integrated together they constraints may stop to hold. For instance, consider di#erent, conflicting addresses for the same person in the taxpayer and the voter registration databases. Each of those databases separately satisfies the functional dependency that associates a single address with each person and yet together they violate this dependency. Moreover, since th

Contributor: The Pennsylvania State University CiteSeer Archives

Publisher: unknown

Date: 2002-07-10

Pubyear: 0

Format: pdf

Identifier: http://citeseer.ist.psu.edu/527841.html

Source: http://www.scs.carleton.ca/~bertossi/papers/bc.pdf

Language: en

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