Publication
Title
Conditional functional dependencies for data cleaning
Author
Abstract
We propose a class of constraints, referred to as conditional functional dependencies (CFDs), and study their applications in data cleaning. In contrast to traditional functional dependencies (FDs) that were developed mainly for schema design, CFDs aim at capturing the consistency of data by incorporating bindings of semantically related values. For CFDs we provide an inference system analogous to Armstrong's axioms for FDs, as well as consistency analysis. Since CFDs allow data bindings, a large number of individual constraints may hold on a table, complicating detection of constraint violations. We develop techniques for detecting CFD violations in SQL as well as novel techniques for checking multiple constraints in a single query. We experimentally evaluate the performance of our CFD-based methods for inconsistency detection. This not only yields a constraint theory for CFDs but is also a step toward a practical constraint-based method for improving data quality.
Language
English
Source (book)
Proceedings of the 23rd International Conference on Data Engineering (ICDE 2007), Istanbul, Turkey, April 15-20, 2007 / Chirkova, Rada [edit.]; et al.
Publication
Los Alamitos, Calif. : IEEE, 2007
ISBN
1-4244-0802-4
Volume/pages
p. 746-755
Full text (Publishers DOI)
UAntwerpen
Faculty/Department
Publication type
Subject
External links
Record
Identification
Creation 14.01.2014
Last edited 21.11.2016