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数据库基础——规范化、关系模式
2022-06-12 08:07:00 【CSDN问答】
一.建立一个描述学校教务的关系模式 S-L-C(Sno, Sdept, Sloc, Cno, Grade),学生的学号(Sno)、所在系(Sdept)、课程名(Cname)、成绩(Grade)、学生住处(Sloc),假设每个系的学生住在同一个地方,函数依赖关系如下图

该关系模式的码是什么?满足2NF吗?为什么?
若不满足,如何分解成2NF,以及分解后的关系模式的码。
二.关系模式:R(A,B,C,D,E,F,G,H)
R上存在的函数依赖有A→B,B→C,(D,E)→A,G→F
(1) 该关系模式的码是什么?满足2NF吗?为什么?
(2) 将关系模式R分解到3NF,是否满足BCNF。
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