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:
Mar. 06, 2007
Filed:
Sep. 24, 2003
Yao-ching S. Chen, Saratoga, CA (US);
Ding-wei L. Chieh, Cupertino, CA (US);
Huong T. Tran, San Jose, CA (US);
Yumi K. Tsuji, San Jose, CA (US);
Guogen Zhang, San Jose, CA (US);
Yao-Ching S. Chen, Saratoga, CA (US);
Ding-Wei L. Chieh, Cupertino, CA (US);
Huong T. Tran, San Jose, CA (US);
Yumi K. Tsuji, San Jose, CA (US);
Guogen Zhang, San Jose, CA (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A method, apparatus, and article of manufacture for optimizing a query in a computer system, wherein the query is performed by the computer system to retrieve data from a database stored on the computer system. The optimization includes: (a) combining join predicates from a query with local predicates from each branch of one or more UNION ALL views referenced by the query; (b) analyzing the combined predicates; and (c) not generating the join when the analysis step indicates that the combined predicates lead to an empty result.