...量传递 ; 关系代数 ; 投影运算 ; 正确性 [gap=744]Key words: database; data quality; quality propagation; relation algebra; projection; accuracy ...
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relation algebra theory 关系代数理论
fuzzy relation algebra 模糊关系代数
temporal relation algebra 时态关系代数
relation algebra operation 关系代数运算
probabilistic relation algebra 概率关系代数
approximate spatial relation algebra 近似空间关系代数
In view of that,the researchers proposed a new rough sets model based on database system and redefined the core attributes and reduction based on relation algebra in order to take advantages of the very efficient set-oriented database operations.
鉴于此,研究人员提出了新的基于数据库系统的粗糙集模型,在关系代数的基础上对核属性和约简进行重新定义,从而利用高效的面向集合的数据库系统操作。
参考来源 - 基于粗糙集理论的属性约简算法研究·2,447,543篇论文数据，部分数据来源于NoteExpress
以上来源于: WordNet
Aim To put forward association rule mining algorithm based on relation algebra theory.
目的提出基于关系代数理论的关联规则挖掘算法。
The math model is used to image the essential relation of every variable in the process, maybe the model is algebra equation, or differential equation, or geometry curve.
数学模型用来反映过程本身各有关变量之间本质关系，它可能是代数方程、微分方程或几何曲线。
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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