Similarity of query results in similarity-based databases
RSKT'11 Proceedings of the 6th international conference on Rough sets and knowledge technology
Attribute implications in similarity-based databases: semantic entailment and nonredundant bases
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Information Sciences: an International Journal
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The article deals with Codd's relational model of data and its fuzzy logic extensions. Our main purpose is to examine, from the point of view of fuzzy logic in the narrow sense, some of the extensions proposed in the literature and the relationships between them. We argue that fuzzy logic in the narrow sense is important for the fuzzy logic extensions because it provides conceptual and methodological foundations, clarity and simplicity. We present several comparative observations as well as new technical results.