Database system and methods are described for improving execution speed of database queries (e.g., for decision support) by optimizing execution of nested queries or "subqueries," such as are commonly used in client/server database environments. In particular, a subquery cache is provided having a size...http://www.google.fr/patents/US5668987?utm_source=gb-gplus-shareBrevet US5668987 - Database system with subquery optimizer
