A system is utilized for determining a relationship between first and second textual inputs. The system identifies constituents in the first textual input, having predetermined characteristics indicative of usefulness in determining the relationship. The relationship is then determined based on the constituents identified. The constituents can be eliminated from the first textual input, weighted in the first textual input, or simply annotated in one of a variety of ways.

 
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> Method and apparatus for selecting candidate statistics to estimate the selectivity value of the conditional selectivity expression in optimize queries based on a set of predicates that each reference a set of relational database tables

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