A Renewal Operation of N1NF Temporal Databases
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摘要: 作者将"调查时间"引进时态数据库,使得关系运算中对于"当前时间"的处理更准确、更完善,进而定义了一种基于关系运算的更新操作机制;对现有的时态数据理论作了其它扩充、简化和改进,使结果更加简明实用。Abstract: In this paper a user-defined time named"survey time"is introduced,which makes the manipulation of the indeterminal time"now"more accurate and proper. And an relational algebra-based renewal operation is also defined.
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Keywords:
- temporal database /
- non first a normal form(NINF) /
- data renewal
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