| 摘要 |
An elementary data type definition table storage 11 stores the data types of various data stored in a database. A complex data type definition table storage 12 stores definitions of various data masses to be offered to users by using the above data type definitions. A complex/elementary data type relation table 13 stores the complex data type definitions expressed in terms of elementary data type definitions, for each of the definitions of various data masses. Through this arrangement, it becomes possible to build a database which may have various data structures, by only implementing a number of definition tables and not preparing any new programs for those structures, thereby to reduce the time, labor and cost required for the preparation of such programs, and to relieve the database builder of technical knowledge usually required for such database construction.
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