The present invention provides a method of searching a plurality of MLS databases including accessing a plurality of MLS databases, resolving an array of schemas from the plurality of MLS databases, establishing a first array of common fields from the array of schemas, establishing a second array of distinct fields from the array of schemas, displaying a search query interface including the first array of common fields and the second array of distinct fields, selecting a root database from the plurality of MLS databases, selecting at least one child database from the plurality of MLS databases, and returning a search query against the root database wherein data from the at least one child database is only included for common fields selected in the search query interface.