| 摘要 |
PURPOSE:To execute automatically and selectively inheritance of a necessary attribute only by considering the inheritance conditions registered beforehand when a slave table is newly prepared from an existing data item. CONSTITUTION:In inheritance conditions memory parts 22A-22C of item attribute memory parts 21A-21C provided for respective data items, the inheritance conditions can be registered beforehand and by an inheritable attribute extracting part 15 and in item attribute inheritance information list preparing part 17, the inheritable attribute is continued. Thus, a user does not need re- define the item attribute each time a slave table 25 is generated. When the inheritance conditions are registered once correctly, the attribute is automatically continued, and therefore, the attribute input error at the time of re-definition is prevented.
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