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:
Oct. 30, 1990
Filed:
Oct. 06, 1989
Akira Yamamoto, Yokohama, JP;
Tadashi Ohsone, Yokohama, JP;
Masashi Tsuchida, Tokyo, JP;
Hiroyuki Kitajima, Yokohama, JP;
Kazuhiro Satoh, Ebina, JP;
Yoshiaki Yamashita, Hadano, JP;
Nobuhiro Taniguchi, Hadano, JP;
Kazuhiko Ohmachi, Kawasaki, JP;
Shinichi Fukushima, Kamakura, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A set of sorted columns of one table stored in a DB machine are binary-searched by a hardware in synchronism with data transfer when another table is read from a disk unit, to select a row to be joined. Where a key word sequence to be searched is stored in ascending or descending order, determination of a maximum address in an area in which key words smaller than a search key are stored and determination of a maximum address in an area in which the key words smaller than or equal to the search key are stored are parallelly executed to determine the store range in one searching.