Which of the following statements best describe the features of a primary key?
Each correct answer represents a complete solution. Choose three.
A.
It uniquely identifies each record.
B.
Its value should be changed time by time.
C.
It should be simple and contain as few attributes as possible.
D.
It should exist when the record is created.
Explanation:
The features of a primary key are as follows:
It uniquely identifies each record.
It cannot be null.
It should exist when the record is created.
Its value should remain stable once it is established.
It should be simple and contain as few attributes as possible.