摘要
从三种传统的确定函数依赖的方法基础上,分析了各种方法的优劣;并从语义分析的角度将数据库设计中用于需求描述的词汇进行分类;最后提出了在显式语义、隐式语义和强制语义环境下函数依赖的确定方法.
This thesis first introduces three traditional methods for the recognition of functional dependency and analyzes the advantages and disadvantages of each method. Then the classification is made under the back- ground of semantic analysis for the vocabularies which appeared in demanding description for database design. Finally, three methods are proposed in the environment of explicit semantics, implicit semantics and strict se- mantics to determine the functional dependency.
出处
《许昌学院学报》
CAS
2013年第2期68-71,共4页
Journal of Xuchang University
关键词
语义分析
关系规范化
函数依赖
semantic analysis
relational normalization
functional dependencies
