A method, apparatus, and article of manufacture for optimizing a query being performed by a computer system to retrieve data from a database stored on the computer system. The query is analyzed to identify any joins therein that are lossless and to identify any tables of the identified joins that are...http://www.google.fr/patents/US6438542?utm_source=gb-gplus-shareBrevet US6438542 - Method of optimally determining lossless joins
