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:
Feb. 03, 2009
Filed:
Dec. 17, 2002
Yao-ching Chen, Saratoga, CA (US);
You-chin Fuh, San Jose, CA (US);
Allan B. Lebovitz, San Jose, CA (US);
Li-mey Lee, Cupertino, CA (US);
Fen-ling Lin, San Jose, CA (US);
Lee-chin Hsu Liu, San Jose, CA (US);
Yun Wang, Saratoga, CA (US);
Binghua Zhen, San Jose, CA (US);
Yao-Ching Chen, Saratoga, CA (US);
You-Chin Fuh, San Jose, CA (US);
Allan B. Lebovitz, San Jose, CA (US);
Li-Mey Lee, Cupertino, CA (US);
Fen-Ling Lin, San Jose, CA (US);
Lee-Chin Hsu Liu, San Jose, CA (US);
Yun Wang, Saratoga, CA (US);
Binghua Zhen, San Jose, CA (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A method for executing a query to access data stored in a database, wherein the query includes a plurality of DISTINCT keys, is disclosed. The method of the present invention includes providing a first DISTINCT operation on a first DISTINCT key, storing data fetched from the first DISTINCT operation in a master workfile if more than one sort process is needed to execute the query, and utilizing the master workfile to perform subsequent DISTINCT operations for the other DISTINCT keys.