关系代数

基于关系代数的XML数据查询

Research on XML data query based on relational algebra

基于Rough表达的时态关系代数

Temporal relational algebra based on rough representation

空值和N关系代数

Nulls and N-Relational Algebra

关系代数运算与SQL查询的对应关系

Corresponding relation of the relational algebra calculus and SQL query

SQL复杂查询到关系代数查询等价性的转换算法

An Algorithm for Equivalence of Translating SQL Into Relational Algebra

关系代数的相应运算在SQL中的实现

Implementation of the Corresponding of Algebra of Relations in SQL

关系代数表达式的类型及SQL语言的实现

Expression Type of Relational Algebra and Application of SQL

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。

Similarly , based on the medium set theory MS , the medium relational algebra can extend the capability of relational algebra .

利用该模型扩充了标准SQL语言的关系代数，实现了混合维定性空间查询语言MQS-SQL。

We improve the algebra of standard SQL with this spatial relation model , design and implement a multi-dimensional qualitative spatial query language MQS-SQL .

类关系代数的OODB理论&关联代数的分析

Analysis of Association Algebra-An OODB Theory Analogous to Relational Algebra

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。

Aiming at how the DBMS query optimizer to generate the smallest cost query plan , optimization rules of the relational algebra expression are given .

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。

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 .

近似空间关系代数ASRA及应用

Approximate Spatial Relation Algebra ASRA and Application

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。

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 .

在给出两Vague元组间ε-相等定义的基础上，较为详细地讨论了Vague关系代数，为在Vague环境下对数据库进行操作提供了依据。

It shows that the vague model can easily describe the database objects in their original appearances . Based on the concept of ε - equal defined on two vague tuples , a vague relation algebra is also discussed in detail so as to operate the database in vague environment .

基于关系代数的模糊综合评判算法的研究和实现

Research and Realize the Relational Fuzzy Comprehension Evaluation Based on Relational Algebra

本文重点介绍了适合于时态数据库的时态关系代数。

It discuss the temporal relation algebra operations fit to temporal database .

查询是Rails3关系代数的一个示例。

The lookup is an example of the Rails 3 relational algebra .

开放任务管理策略与工作流属性关系代数

Open task management policy and workflow attribute relational algebra

空值环境下的基本关系代数及其最小完备性识解操作与名动互转

The Foundational Operations in Relational Algebra and Its Completeness under Null Value Circumstance

将查询表示成常规的关系代数表达式的一般方法

General Method Representing Query as conventional Relation Algebra Expression

基于关系代数的遗传算法模型及其应用

Relation algebra based genetic algorithm model and its applications

模糊时态数据库关系代数演算规则分析

Analysis of Calculus Rules on Fuzzy Temporal Relational Algebra

基于时态关系代数的工作流引擎

Workflow engine on top of temporal relational algebra

关系代数等效转换规则是查询优化中非常重要的一种方法。

Algebraic transformation is an important issue of query optimization in fuzzy relational databases .

一种模糊关系代数与模糊关系演算

A Fuzzy Relational Algebra and Fuzzy Relational Calculus

目的提出基于关系代数理论的关联规则挖掘算法。

Aim To put forward association rule mining algorithm based on relation algebra theory .

实时数据库系统的时态关系代数

Temporal Relational Algebra in Real time Database Systems

分布式数据库中的限定关系代数变换

Transformations of restricted relational algebra in distributed database

基于扩展关系代数的数据集成映射模式的研究

Research on relational-algebra-based schema mapping of data integration