A primary key is a composite key that was selected to be the main identifier for the relation.
A. True
B. False
Answer: Option A
Solution (By Examveda Team)
Option1: True- A primary key is a unique identifier for each record in a table. - It can be a single attribute or a combination of multiple attributes. - In the case of a composite key, it is a key that consists of more than one attribute to uniquely identify a record. - Therefore, a primary key can indeed be a composite key that serves as the main identifier for the relation. Option2: False
- This statement is incorrect as explained above. - A primary key can be a composite key and is often used as the main identifier for a relation. Conclusion:
- The correct option is True as a primary key can be a composite key that serves as the main identifier for a relation.
This Question Belongs to Database >> The Relational Model And Normalization
Related Questions on The Relational Model and Normalization
A. A → B.
B. A → C.
C. A → (B,C).
D. (B,C) → A.
A. normal forms.
B. referential integrity constraints.
C. functional dependencies.
D. None of the above is correct.
A relation is in this form if it is in BCNF and has no multivalued dependencies:
A. second normal form.
B. third normal form.
C. fourth normal form.
D. domain/key normal form.
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