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WOLLIC
2010
Springer
14 years 24 days ago
On the Role of the Complementation Rule for Data Dependencies over Incomplete Relations
Recently, an axiomatization for functional dependencies (FDs) and multivalued dependencies (MVDs) has been established where arbitrary attributes can be specified as NOT NULL. Tha...
Flavio Ferrarotti, Sven Hartmann, Sebastian Link
ER
1995
Springer
120views Database» more  ER 1995»
13 years 11 months ago
Semantics of Time-Varying Attributes and their Use for Temporal Database Design
Based on a systematic study of the semantics of temporal attributes of entities, this paper provides new guidelines for the design of temporal relational databases. The notions of ...
Christian S. Jensen, Richard T. Snodgrass
CLA
2006
13 years 9 months ago
Graded LinClosure and Its Role in Relational Data Analysis
We present graded extension of the algorithm LinClosure. Graded LinClosure can be used to compute degrees of semantic entailment from sets of fuzzy attribute implications. It can a...
Radim Belohlávek, Vilém Vychodil