黄明智, 张祖勋. N1NF时态数据库及其更新操作[J]. 武汉大学学报 ( 信息科学版), 1996, 21(2): 139-144.
引用本文: 黄明智, 张祖勋. N1NF时态数据库及其更新操作[J]. 武汉大学学报 ( 信息科学版), 1996, 21(2): 139-144.
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Huang Mingzhi, Zhang Zuxun. A Renewal Operation of N1NF Temporal Databases[J]. Geomatics and Information Science of Wuhan University, 1996, 21(2): 139-144.
Citation: Huang Mingzhi, Zhang Zuxun. A Renewal Operation of N1NF Temporal Databases[J]. Geomatics and Information Science of Wuhan University, 1996, 21(2): 139-144.
shu

N1NF时态数据库及其更新操作

A Renewal Operation of N1NF Temporal Databases

    摘要
  • 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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