Home » MCQs » Oracle MCQs » Oracle Change Password, Check Constraints, Comments, and Primary Key MCQs

____ keys in Oracle are columns with unique values, and they cannot contain nulls

9. ____ keys in Oracle are columns with unique values, and they cannot contain nulls.

1. Primary
2. Foreign
3. Alternate
4. Composite

Answer: A) Primary

Explanation:

Primary keys in Oracle are columns with unique values, and they cannot contain nulls.