关系代数表达式的分步构造方法探讨

A Study on the Stepping Construction of Relational Algebra Expressions

关系代数一直是数据库概论教学中重点内容,也是学生们普遍难以全面掌握的内容。基于此提出了如何采用分步方式正确书写关系代数表达式,此方法层次分明,易于理解,并结合实例详细的阐述了分步书写关系代数表达式的步骤,以更好地帮助学生体会和理解分步书写的方法,从而全面准确掌握关系代数表达式。

Relational function has always been an important part in the teaching of the introduction to database,and a difficult section for students. The paper hereinafter proposed a method to write out a relational function expression,which is fairly easy to understand with clear-cut layers because it exemplified the practice in detail. It will aid students to understand the operational procedures,and help them grasp the knowledge more accurately as a result.