The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 17, 2011
Filed:
May. 25, 2007
Qi Cheng, Markham, CA;
Mir Hamid Pirahesh, San Jose, CA (US);
Yang Sun, Morgan Hill, CA (US);
Calisto Paul Zuzarte, Pickering, CA;
Qi Cheng, Markham, CA;
Mir Hamid Pirahesh, San Jose, CA (US);
Yang Sun, Morgan Hill, CA (US);
Calisto Paul Zuzarte, Pickering, CA;
International Business Machines Corporation, Armonk, NY (US);
Abstract
A set of algebraic rules applicable to a query are identified, wherein each of the algebraic rules represents a relationship between two columns in a relational database table. A source column is identified by searching the query for a source predicate, wherein the source predicate is a range predicate. One or more candidate target columns are identified by searching the set of algebraic rules, wherein each of the candidate target columns occurs on one side of a binding expression and the source column occurs on the other side of the binding expression. For each of the one or more candidate target columns, a bounds subquery that provides a lower bound and an upper bound for a new range predicate is derived and he new range predicate is introduced into the query, wherein the query is executed to retrieve data from one or more data stores.