Title :
Bipolar Queries and Queries with Preferences (Invited Paper)
Author :
Zadrozny, Slawomir ; Kacprzyk, Janusz
Author_Institution :
Syst. Res. Inst., Polish Acad. of Sci., Warszawa
Abstract :
The concepts of bipolar queries and queries with preferences are studied. Various interpretations of the former, recently defined by Dubois and Prade, are discussed. The latter was defined by Chomicki together with a new relational algebra operator winnow. The fuzzy version of the winnow operator is proposed. It is shown how it may be used to express a selected interpretation of the bipolar queries
Keywords :
fuzzy set theory; query processing; relational algebra; bipolar query; query with preference; relational algebra operator winnow; winnow operator fuzzy version; Algebra; Expert systems; Fuzzy sets; Information technology; Rail transportation; Relational databases;
Conference_Titel :
Database and Expert Systems Applications, 2006. DEXA '06. 17th International Workshop on
Conference_Location :
Krakow
Print_ISBN :
0-7695-2641-1
DOI :
10.1109/DEXA.2006.36
