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:
Jul. 06, 2004
Filed:
Jul. 05, 2001
Applicant:
Inventor:
Takayuki Tamura, Tokyo, JP;
Assignee:
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G06F 1/730 ;
U.S. Cl.
CPC ...
G06F 1/730 ;
Abstract
A database operation processor includes a self-join detector for detecting if a self-join operation is included in a query statement for a table in a database and generating a self-join operation expression, a join key classifier for classifying a join key included in a join condition in the operation expression into an equi-join key or a non equi-join key based on the generated self-join operation expression, and a self-join operation executor for sorting records stored in the table by the equi-join key, inputting in the sorted table, executing the generated self-join operation expression, and producing a result for the query statement.