# relational algebra中文什么意思

## 例句与用法

1. 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。
2. 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。
3. 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。
4. 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。
5. 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。

## 百科释义

In computer science, relational algebra is an offshoot of first-order logic and of algebra of sets concerned with operations over finitary relations, usually made more convenient to work with by identifying the components of a tuple by a name (called attribute) rather than by a numeric column index, which is what is called a relation in database terminology.