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_________。【图片】
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)
发布时间:2024-04-14 21:15:07