| 摘要: |
| 面向对象技术为关系数据库设计提供了一些有用的方法．本文给出了继承约束的概念，并证明了继承依赖的推理规则是正确、完备的．本文述得出继承依赖闭包、继承依赖的极小集合等一系列平行于函数依赖的结论． |
| 关键词: 继承，关系数据库，关系模式，面向对象，依赖， |
| DOI： |
| 分类号: |
| 基金项目: |
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| A RELATIONAL DATA MODEL WITH INHERITANCE DEPENDENCIES |
|
Liu Weiyi,LU Yuan
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| Abstract: |
| Object—oriented concepts provide some useful methods for designing s rela-tional database．In this paper，the concept of inheritance constraints is given．The authors show that the inference rules for inheritance dependencies are sound and complete．Fur-thermore,a series of results about the closure of inheritance dependencies，the minimal set of inheritance dependence is obtained，which arc analogous to functional dependencies． |
| Key words: Inheritance．relational database,relationaI scheme,object—oriented,depen-dency． |
