摘要
关系数据理论是数据库设计中的重要理论基础,是《数据库原理》课程的重点章节,属性闭包在关系数据理论中占着重要地位。如何组织该章节的内容,在讲课过程中显得相当重要。本文介绍了闭包的含义、计算方法以及如何利用属性闭包确定候选键、确定关系模式的最高范式。
The relational data theory is in the database designimportant rationale, is “Database Principle” the curriculum keychapter, the attribute shuts wraps in the relational data theory tooccupy the importan status. Organizes how to this chapter content,will appear in the teaching process quite importantly. This articleintroduced shuts the package the meaning, the computational method aswell as shuts the package of determination candidate key, thedetermination relations pattern highest model using the attribute.
出处
《科技广场》
2007年第3期255-256,共2页
Science Mosaic
关键词
闭包
候选键
函数依赖
范式
Shuts the package： Candidate key
Function dependence
Model
