Apparatus, method, and computer program product for...

Details Apparatus, method, and computer program product for... Apparatus, method, and computer program product for...

2011-08-16

2011-08-16

Vital, Pierre M (Department: 2156)

Data processing: database and file management or data structures

Database and file access

Query optimization

Reexamination Certificate

active

08001110

ABSTRACT:
An obtaining request requesting that information is obtained from a structured database by using multiple loops is received. A unique identifier is assigned to each of records in element tables each having been created for a different one of the loops. A cross product joined table is created by performing a cross product joining process on the element tables, so that the information specified as an obtained target in the obtaining request is obtained from the element tables. For each of the loops, a single-loop table storing therein records in which the obtained information, the identifiers, and the elements are brought into correspondence is created. An inter-loop joined table is created by joining the plurality of single-loop tables. A correspondence between the records in the cross product joined table and in the inter-loop joined table are controlled, based on the identifiers contained in the cross product joined table and the inter-loop joined table.

REFERENCES:
patent: 7680782 (2010-03-01), Chen et al.
Per Bothner, Qexo: The GNU Kawa Implementation of XQuery, verified earliest date as May 14, 2002, on archive.org, http://www.gnu.org/software/qexo/.
Fernandez, et al., Implementing XQuery 1.0: The Galax Experience, Proceedings of the 29th VLDB Conference, Berlin, Germany, 2003.

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