Title :
Comparing priority, weighted and queries with threshold in PFSQL
Author :
Aleksandar Takaci;Srdjan Skrbic
Author_Institution :
Faculty of Technology, University of Novi Sad, Serbia. atakaci@uns.ns.ac.yu
Abstract :
PFSQL is the query language used for querying fuzzy relational databases. One of the most recognizable features of PFSQL is the possibility to prioritize conditions. Priorities are most often confused with weights. In this paper we compare queries with prioritized conditions with queries with weighed conditions. Since PFCSP systems are the theoretical background for PFSQL and similarly WFCSP are the theoretical background for weighted queries we elaborate these two systems. Queries with thresholds are another feature of PFSQL. When a threshold is attached to a condition only the tuples that satisfy the condition with a higher value then the threshold are displayed in the result. Through examples we compare these features of PFSQL.
Keywords :
"Relational databases","Fuzzy sets","Investments","Database languages","Intelligent systems","Deductive databases","Informatics","Fuzzy systems","Algebra","Calculus"
Conference_Titel :
Intelligent Systems and Informatics, 2007. SISY 2007. 5th International Symposium on
Print_ISBN :
978-1-4244-1442-0
Electronic_ISBN :
1949-0488
DOI :
10.1109/SISY.2007.4342628