Przeglądaj {{ collection }} wg Autor "Myszkorowski, Krzysztof"

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Fuzzy querying with the use of interval-valued fuzzy sets
(Wydawnictwo Politechniki Łódzkiej, 2013) Myszkorowski, Krzysztof; Superson, Izabela
The paper deals with flexible queries in relational databases. Conditions included in queries are modeled with the use of interval-valued fuzzy sets. Each value returned by a query is associated with a subinterval of [0,1] which expresses a membership degree. The bounds of membership intervals have been determined for different operations of relational algebra and different SQL operators.
Integrity Rules for Multiargument Relationships in Possibilistic Databases
(Wydawnictwo Politechniki Łódzkiej, 2016) Myszkorowski, Krzysztof
The paper contains an analysis of multiargument relationships in possibilistic databases. A multiargument relationship may be formally presented using the relational notation R(X1, X2,...,Xn), where R is the name of the relationship and attributes Xi denote keys of entity sets which participate in it. The dependencies between all n attributes describe the integrity constraints and must not be infringed. They constitute a restriction for relationships of fewer attributes. In the paper it is considered a possible coexistence of associations between k < n attributes of the n-ary relationship. The analysis is carried out using the theory of fuzzy functional dependencies. The notion of functional dependency has been appropriately extended according to the representation of data.
Klasyczne i rozmyte bazy danych : modele, zapytania i podsumowania
(Akademicka Oficyna Wydawnicza EXIT, Warszawa, 2008) Zadrożny, Sławomir; Myszkorowski, Krzysztof; Szczepaniak, Piotr S.; Piecha, Jan