2. The method of claim 1 wherein the selectivity of the at least one of the query predicates is calculated from a function of the calculated row count and a base table row count of a database table associated with the at least one of the query predicates.
6. The method of claim 2 wherein the join index predicate(s) qualify a set of rows from the database table associated with the at least one of the query predicates, the qualified rows representing a superset of a set of rows qualified by the query predicate(s) on the base table.