如下所示Chen方法表达的E-R图,将其转换为关系模式。不正确的选项是_________。
A.可以如下转换 person(name, street, city) customer(name, credit-rating) employee(name, salary)
B.可以如下转换 person(name, street, city) customer(name, street, city, credit-rating) employee(name, street, city, salary)
C.在一定条件下也可以如下转换 customer(name, street, city, credit-rating) employee(name, street, city, salary)
D.在一定条件下也可以如下转换 customer(name, credit-rating) employee(name, street, city, salary)
- · 有3位网友选择 D,占比17.65%
- · 有3位网友选择 D,占比17.65%
- · 有2位网友选择 B,占比11.76%
- · 有2位网友选择 A,占比11.76%
- · 有2位网友选择 A,占比11.76%
- · 有2位网友选择 B,占比11.76%
- · 有2位网友选择 C,占比11.76%
- · 有1位网友选择 C,占比5.88%