| 摘要 |
PURPOSE:To attain the retrieval of table data with the highest accuracy by retrieving the column of a real data while referring a table where the hierarchical relation is defined among the names in a data storage column and therefore reducing the load of the retrieving job. CONSTITUTION:When a retrieving sentence is supplied from a terminal equipment 202, a data base control system DBMS 206 transfers the table type data showing the hierarchical relation to a buffer area 207 from an external memory device 201. Then a column name key word and a document name emerging in a retrieving sentence are extracted within an area 207. The retrieving document is converted with reference to proper names in a table type data column. Then the DBMS 206 transfers a relative table type data in the device 201 to the area 207 and extracts the value whose output is requested to transmit it to the equipment 202 and to display it as the result of retrieval. Thus the load of a retrieving job is reduced with the table type data and the retrieval of the table data is possible with the highest accuracy.
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