| 摘要 |
PROBLEM TO BE SOLVED: To make it unnecessary to prepare a plurality of identical data tables in order to optimize a schema, and to suppress the usage of a storage capacity. SOLUTION: A database retrieval server 200 selects one or a plurality of data tables from a plurality of different data tables according to retrieval conditions received from a client PC 100, and decides a schema constituted of the selected data tables. Then, a database retrieving server 200 performs data retrieval under the retrieval conditions by using the database of the decided schema as an objective. COPYRIGHT: (C)2005,JPO&NCIPI
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