A system and method for managing queries including receiving a new query comprising a first plurality of conjoined terms, accessing a filtered view of a database from memory, the filtered view being filtered by the previously received query according to a filter represented by a second plurality of conjoined terms, at least one of the first plurality of conjoined terms or the second plurality of conjoined terms including at least one NULL value, determining that the filter of the new query implies a filter of the previously received query, and based on the determination that the filter of the new query implies the filter of the previously received query, executing the new query using the filtered view of the previously received query.