Detailed explanation and options for the selected question.
Which of the following statements about composite primary keys is true?
A.
A composite key consists of two or more columns
B.
It allows duplicate values in all columns
C.
It can only reference a single column
D.
It cannot be used as a foreign key
Explanation:
A composite primary key consists of two or more columns. It does not allow duplicates across all columns. It can reference multiple columns and serve as a foreign key.