relational algebra
具有良好的语义基础。
常用释义
英式发音
美式发音
基本释义
- 关系代数：一种使用代数结构对数据进行建模并定义查询的理论，具有良好的语义基础。
例句
-
1·The lookup is an example of the Rails 3 relational algebra.查询是 Rails 3 关系代数的一个示例。
-
2·In relational databases, an operation in relational algebra.在关系数据库中，关系代数中一种操作。
-
3·Rails 3 incorporates relational algebra, a DSL designed to express queries.Rails 3 合并了 relational algebra，这是专门设计用于表示查询的 DSL。
-
4·The derived relational algebra operators are widely used in the relational database query languages.关系代数的派生算子在关系数据库查询语言中得到了广泛应用。
-
5·Similarly, based on the medium set theory MS, the medium relational algebra can extend the capability of relational algebra.同样地，中介关系代数以中介集合论MS为基础，扩充了关系代数的功能。
-
6·Is also a great introduction to this topic and shows the motivation and theory behind the "relational algebra" in ActiveRecord 3.也是一个关于此话题的很好的介绍，解释了ActiveRecord 3中的“关系代数”背后的的动机和理论。
-
7·Its fuzzy knowledge representation, fuzzy relational algebra and the inaccurate reasoning implementation policies are described in detail.详细介绍了其模糊知识表示、模糊关系代数及不精确推理的实现策略。
-
8·Aiming at how the DBMS query optimizer to generate the smallest cost query plan, optimization rules of the relational algebra expression are given.针对DBMS查询优化器如何生成成本最小的查询计划问题，给出关系代数表达式的优化规则。
-
9·For example, Clojure has a delightful implementation of sets and operations on sets, as well as some quasi-relational algebra thrown in for good measure.例如，Clojure有一个友好的Set及Set操作实现，以及一些准关系代数实现。
-
10·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。