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. 08, 2005
Filed:
Aug. 22, 2001
Hong Gui, Madison, WI (US);
Curt J. Ellmann, Madison, WI (US);
Grace AU, Rancho Palos Verdes, CA (US);
Ahmad S. Ghazal, Redondo Beach, CA (US);
Hong Gui, Madison, WI (US);
Curt J. Ellmann, Madison, WI (US);
Grace Au, Rancho Palos Verdes, CA (US);
Ahmad S. Ghazal, Redondo Beach, CA (US);
NCR Corporation, Dayton, OH (US);
Abstract
A method and apparatus determines (1) if a materialized view can be used to respond to a query for data stored in one or more base tables of a database system; and/or (2) if the materialized view needs to be updated in response to an update query. A query expression tree represents the query, and a materialized view expression tree represents the materialized view. The components of the query expression tree are compared with components of the materialized view expression tree to determine if the materialized view covers the query that is, the tuples in the result of the query expression are a subset of the tuples in the result of the materialized view expression.