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:
Jan. 03, 2006
Filed:
Apr. 16, 2002
Fred Koo, Thornhill, CA;
Timothy Ray Malkemus, Round Rock, TX (US);
Fred Koo, Thornhill, CA;
Timothy Ray Malkemus, Round Rock, TX (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
Database Management Systems (DBMS) manage data stored in tables and process database queries against that stored data. The database queries typically specify search conditions (that is, 'predicates') for qualifying database search results to be output by the DBMS. When a database table definition or query includes a given predicate having an expression that operates on a column of a table, it is useful to know whether the expression is monotonic. If the expression is determined to be monotonic, the present invention provides operations for deriving a new predicate from the given predicate for use in a new database query. Advantageously, the use of a new or derived predicate improves operational efficiency of the DBMS. Operation is provided for detecting a type of monotonicity related to the expression, and uses the detected type of monotonicity for generating the derived predicate.