Abstract: A Sort-on-the-Fly/Search-on-the-Fly search engine provides an intuitive mechanisms for searching databases, allowing a user to access data in the database without having to know anything about the database structure. A user selects a desired search term, and the search engine searches the database for all instances of the desired term, even if a specific file or table does not contain the instance. The database need not have a specific file (in a flat database) or a table (in a relational database) of names. The user may specify other criteria, or constraints to narrow the search results, or for other reasons. The search engine then conducts a further search using this criteria and produces a second search result. Further narrowing or broadening of the search are permitted, with the search-on-the-fly search engine returning results based on any new constraints.