高等继续教育 / 计算机专业英语
正确率：100%
题型描述: 单选题
Which of the following items need not have unique values in the referencing relation? _ _ _ _ _ _ _ _ _ _
A.Composite key
B.Foreign key
C.Primary key
D.Surrogate key
Which of the following items need not have unique values in the referencing relation? _ _ _ _ _ _ _ _ _ _
A.Composite key
B.Foreign key
C.Primary key
D.Surrogate key
参考答案：