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. 16, 2001
Filed:
May. 06, 1998
Barry Keith Aldred, Winchester, GB;
International Business Machines Corporation, Armonk, NY (US);
Abstract
A data retrieval system stores a plurality of objects having a multi-level hierarchical relationship, each object having a respective parent and a set of children. The system stores one or more base tables, the or each base table comprising a respective set of attributes associated with a sub-set of objects in the system, and generates for the or each base table a respective complementary table, the or each complementary table comprising a set of attributes excluding the attributes of the associated base table. The system further includes an expression optimiser adapted to interpret a query comprising an expression including one or more operations, each operation having a respective operator and one or more associated operands. The optimser tracks a number of objects associated with the or each operation and any attributes associated with the operation; and re-formulates the expression accordingly.