5. The a priori method of claim 3 , wherein a ratio of a first cardinality of distinct value pairs in one of said selected column pairs to a second cardinality of distinct value pairs in said relational databases is used to identify and eliminate said trivial instances of correlation.
5. The a priori method of claim 3 , wherein a ratio of a first cardinality of distinct value pairs in one of said selected column pairs to a second cardinality of distinct value pairs in said relational databases is used to identify and eliminate said trivial instances of correlation. 7. The a priori method of claim 5 , wherein each of said trivial instances of correlation indicates a trivial column when said ratio for at least one of said selected column pairs is equal to one.