发布时间 : 2024/6/26 23:00:23 星期三 文章数据库系统基础教程答案ch4更新完毕开始阅读

b)

c)

The relationship \\

4.1.5

4.1.6 The information about children can be ascertained from motherOf and

fatherOf relationships. Attribute ssNo is required since names are not unique.

4.1.7

4.1.8 a)

(b)