关系数据库中关系代数范畴模型的讨论
Discussion of Category Model of Relational Algebra in Relational Database
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摘要: 为了解决关系表的多重选择和投影运算的优化问题,运用范畴理论构建了关系数据库的范畴模型,并对 其性质进行了讨论.以该范畴模型为基础,探讨了关系数据库中关系代数等价变换规则中的选择运算和投影运 算的串接定律,并对其功能进行了扩充.Abstract: To optimize multi-condition selection and projection operations in a relational database, a category model for relational databases was established based on the category theory and its characters were discussed. On the basis of this model, the connecting laws of selection and projection operations in the equivalent transformation of relational algebra in a relational database were investigated and the functions of the laws were extended.
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Key words:
- relational database /
- relational algebra /
- category model
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