relational algebra
英 [rɪˈleɪʃənl ˈældʒɪbrə]
美 [rɪˈleɪʃənl ˈældʒɪbrə]
网络 关系代数; 关系型代数; 式代數; 关联式代数; 关联代数
双语例句
- The lookup is an example of the Rails 3 relational algebra.
查询是Rails3关系代数的一个示例。 - Another benefit of the move to DB29 is the hybrid storage engine and a query optimizer that "understands" XML ( mapping to relational algebra for queries involving XML).
迁移到DB29的另一个好处是，混合型存储引擎和查询优化器“理解”XML，可以把涉及XML的查询映射为关系语法。 - 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。 - In relational databases, an operation in relational algebra.
在关系数据库中，关系代数中一种操作。 - Analysis of Calculus Rules on Fuzzy Temporal Relational Algebra
模糊时态数据库关系代数演算规则分析 - 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。 - The Relational Algebra and its Representation Theory
关系代数及其表示理论 - Research and Realize the Relational Fuzzy Comprehension Evaluation Based on Relational Algebra
基于关系代数的模糊综合评判算法的研究和实现 - Based on a concept of main memory database system ( MMDBS) and the SB tree indexing structure, this paper proposed a SB tree indexing structure which was more suitable for relational algebra operations in an MMDBS.
基于一种广泛接受的内存数据库系统基本概念及内存数据库中的SB树索引结构，提出了更方便关系代数操作的SB树。 - 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。 - In query algebra, there has been some special temporal operations which can access objects by three associations: aggregation, generalization, time-reference, and the algebra reflects the spirit of both temporal relational algebra and object algebra.
在查询代数中，引入了一些特殊的时态操作，通过聚集、概括和时间参考三种关联对对象进行访问，而且此代数同时反映了时态关系代数和对象代数的特点。 - Based on this model, this paper constructs two different kinds of fuzzy database query languages: the fuzzy relational algebra and fuzzy relational calculus.
在此基础上，构造了两类不同的模糊数据库查询语言：模糊关系代数和模糊关系演算。 - This paper illustrates the process of query optimization based on equivalence of relational algebra, and discusses the model of query cost.
本文通过一个实例，详细介绍了基于关系代数等价变换规则的关系代数查询优化原理及实现过程，最后就此方法的代价评估模型进行了讨论。 - In order to support the formal research on task management policy, the concepts of attribute schema and attribute relation were introduced and the fundamental operations for workflow attribute relational algebra were defined.
为支持任务管理策略的形式化研究，引入了属性模式和属性关系等概念，定义了工作流属性关系代数的基本运算。 - Temporal Relational Algebra in Real time Database Systems
实时数据库系统的时态关系代数 - Temporal relational algebra based on rough representation
基于Rough表达的时态关系代数 - Research on XML data query based on relational algebra
基于关系代数的XML数据查询 - This paper discusses the capabilities and methods rules of Horn clause are expressed in relational algebra and SQL, and points out that deductive rules have a strong affinity to views in relational databases.
本文讨论了关系代数及SQL语言表示Horn子句规则的能力与方法，指出关系数据库的视图与规则有很强的相似性。 - Quotient set is one of the most important conception of relational algebra. It is widely used in computer science and technology information science and information engineering.
商集是关系代数中的一个重要概念，在计算机科学和技术、信息科学和信息工程中都有广泛的应用。 - A Fuzzy Relational Algebra and Fuzzy Relational Calculus
一种模糊关系代数与模糊关系演算 - Corresponding relation of the relational algebra calculus and SQL query
关系代数运算与SQL查询的对应关系 - Discussion of Category Model of Relational Algebra in Relational Database
关系数据库中关系代数范畴模型的讨论 - Relational algebra can be conveniently used to manage, analyse and reuse C code.
借助于关系代数可方便地对源代码进行有效的管理、分析与重用。 - Studied the influence of the time factor and the space factor to the traditional relational algebra and the operations after space and temporal expanding, and put forward and carried out data operation methods.
研究了进行空间和时态扩展后时间要素和空间要素对传统关系代数、关系运算的影响，提出并实现了相应的数据操作方法； - This paper establishes a temporal relational algebra and a tern-poral tuple calculus, and proves their equivalence.
建立了一个时态关系代数和时态元组演算并证明了他们间的等价性。 - Transformations of restricted relational algebra in distributed database
分布式数据库中的限定关系代数变换 - This paper introduces the concept of generalized fuzzy relation and extends relational algebra operators such as union, intersection, difference, Cartesian product, selection, projection etc.
文中引入了广义模糊关系的概念，讨论了广义模糊关系代数的操作：广义模糊并、广义模糊交、广义模糊差、广义模糊笛卡尔积、广义模糊投影和广义模糊选择等。 - The paper presents relational query authentication model based on Hierarchical Hash Chain, and designs some extensible authentication methods to relationship-oriented database. Moreover, this paper achieves authentication in relational algebra, which includes select, projection, join, aggregate functions and other query operations.
论文以层次哈希链为基础构建了关系查询认证模型，设计了一套可扩展的面向关系数据库的查询结果认证方法，实现了关系代数中选择、投影、连接和聚集函数的查询认证。 - PAR method of Apla one of the characteristics of language is to relational algebra operations into programming languages, which makes Apla database program can be directly used for the development.
PAR方法中的Apla语言的特色之一是把关系代数操作纳入程序设计语言中，这使得Apla可以直接用于数据库程序的开发。 - It is important to master relational algebra theory for in-depth study of the database system principle.
熟练掌握关系代数理论知识对于数据库系统原理的深入研究有着至关重要的作用。