This paper deals with database fuzzy queries in the context where the fuzzy preference conditions involved are of a bipolar nature (the first pole corresponding to a constraint, the second to a wish). More precisely, we consider queries where an inclusion-based condition comes into play (a typical example being a division query). Due to the fact that bipolar fuzzy queries entail using a framework where bipolar fuzzy relations are handled, we are led to defining generalized inclusion indicators in this context. This paper proposes an interpretation of such indicators and investigates their properties as well as their practical use in a database querying context.
['Ludovic Lietard', 'Olivier Pivert', 'Daniel Rocacher']
On a Graded Inclusion of Bipolar Fuzzy Relations