... relational algebra machine 关系代数机 temporal relational algebra 时态关系代数 Codd's Relational Algebra 发表将资料组成表格的应用原则 ...
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Finally, bitemporal relation is defined as the set of the temporal mapping tuple, and the bitemporal relational algebra operations are described formally.
最后,用时态映射定义的元组对双时态关系进行定义,并由此给出双时态关系代数运算的形式化描述。
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