Which of the following defines entity integrity constraint?

2022

Answer: A. The value of primary key cannot be null.

1. A.

   The value of primary key cannot be null.

2. B.

   The value of foreign key cannot be null.

3. C.

   The value of prime attribute cannot be null.

4. D.

   The value of non-prime attribute cannot be null.

Attempted by 1142 students.