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.
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.
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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