Home » MCQs » DBMS MCQs » DBMS Keys MCQs

What is TRUE about Primary Key?

3. What is TRUE about Primary Key?

1. An entity can only be uniquely identified by using the first key
2. From these lists, the most appropriate key becomes a primary key
3. Primary keys are selected for each entity according to its requirements and developers
4. All of the above

Answer: d) All of the above

Explanation:

In case of Primary Key -

1. An entity can only be uniquely identified by using the first key
2. From these lists, the most appropriate key becomes a primary key
3. Primary keys are selected for each entity according to its requirements and developers