Querying a database with fuzzy attribute values by iterative updating of the selection criteria

Fuzziness in database management systems: Half a century of developments and future prospects

“…Among the most relevant, Baldwin et al [6] have implemented a system for querying a possibilistic relational database using semantic unification, and Bosc and Pivert [24] proposed queries about the parameters of the possibility distribution, e.g., "Find tuples such that more than n values are possible to a degree higher than λ for an attribute A".…”