关系数据库系统的参数视图定义方法及实现
The Implementation of Parameterized View Definition for Relational Database Systems
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摘要: 本文描述并实现了一种关系数据库系统视图定义的扩充方法,即参数化视图定义方法。该方法可根据对视图的动态赋值,在不扩充其运算符及过程结构的情况下定义递归关系。本文还给出了扩充的、具有视图参数定义功能的SQL 语言向上兼容的语法。Abstract: The concept of parameterized view definition mechanism for relational database sys- tems is presented and implemented in this paper.Dynamic binding of parameters for the view allows the definition of recursive relations,such as transitive closure,without using extended operators or proce- dural constructs such as loops.Upward compatible syntax for SQL that incorporates parameterized view is also proposed.
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