# relational algebra in Chinese

• 相关代数, 关系代数
###### Examples
• In relational databases , an operator in relational algebra
在关系数据库中，关系代数用的一种运算符。
• It is implied by the associative and commutative transformations permitted in relational algebra
它由关系代数中允许的关联转换和交换转换表示。
• Leap is an rdbms ( relational database management system ) implementing the relational algebra - a core part of relational database theory
Leap是一个rdbms ，它实现了关系代数，关系数据库理论的一个核心部分。
• A clause is formalized as a relational algebra expression and evaluated by employment of relational algebra operations . 3 . the proof theory based on xml is presented
提出了利用关系代数运算实现xml查询子句求值的方法，并证明了该方法的正确性。
• This course is designed to introduce graduate students to the foundations of database systems , focusing on basics such as the relational algebra and data model , query optimization , query processing , and transactions
课程描述本课程设计的目的是给研究生介绍数据库的基础知识，关注于基础，如关系代数和数据模型，查询优化、查询处理和事务。
• An approach to formalize and evaluate relational algebra operations by means of xdd is presented . a query is formalized as one or more xml clauses and evaluated by employment of equivalent transformation of xdd
提出了根据关系代数表达式构造查询子句的方法，关系代数表达式可以用若干个xml子句描述，并通过等价变换得到查询结果，证明了该方法的正确性。
• In addition , because there is internal relationship between the formalism of relational database , " relational algebra " , and the clausal logic used by ilp , ilp methods can directly deal with mining task involved in multiple tables of relational database
此外，由于关系数据库的形式描述? “关系代数”与ilp的子句逻辑有着内在的关联性， ilp技术可被直接用于涉及关系数据库中多个关系(表)的数据挖掘任务。
• At the same time , we propose a representative data model , i . e . gt data model , and its query language . theoretically , we deeply study the temporal relational algebra and sql - like language based on our ter model , laying a solid theoretic foundation for our accelerator rjf cavity design system
因此，论文提出了一个概念性数据模型，即时态实体一关系数据模型（ ter模型厂提出了一个表示性数扼模型，即gt数据模型及其查询语言。
• In order to unify stored data - mining results in pattern warehouse , the author probes intensively into the storage methods of data - mining results ( association rules , classification rules , sequential patterns ) . it proposes the storage methods to use the relational algebra to describe . this realizes consistent storage of data - mining results in relational database
为使数据挖掘结果能统一存储在模式库中，作者对关联规则、分类规则和序列模式挖掘结果的存储方法进行了深入的研究，提出了数据挖掘结果模式的存储方法，并用关系代数进行了描述，在关系数据库中实现了多种数据挖掘结果模式的统一存储。
• Topics include : relational databases , sql ( structured query language ) ; types , relations , relational algebra , integrity , view ; functional dependency theory , normalization , semantic modeling , entity - relationship modeling , conceptual database design ; concurrency control , security ; database and web connectivity , xml
主题包括:关联式资料库、 sql (结构查询语言) ;资料类型、关联、关联式代数、完整性、景观表;功能依附理论、正规化、语义塑模、实体关联塑模、概念性资料库设计;同时操作控制、安全;资料库与网页连结、 xml (可扩展标示语言) 。
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