| 摘要 |
PURPOSE:To efficiently realize a distributed data base by providing a lending definition means for specifying the lending of table data and disposing with a duplication to the arbitrary part unit of the table data. CONSTITUTION:The lending definition part 24 receives the lending request of the table data, and then, checks the validity of a definition area condition of a constraint condition by the use of a collecting relation judging part 29 to permit the lending. A lending execution part 25 extracts sub-set data satisfying the constraint condition from the table data in which the lending is permitted and forms a sub-set table in an instructed sight. In this step, an original table and the sub-set are present with the duplication. Thereby, an inquiry execution part 23 checks the inquiry to the table data and the sub-set by the use of the collecting relation judging part 29 and executes the inquiry to the table data or the sub-set. |
