Identify incorrect statement about primary keys

Q: Identify incorrect statement about primary keys

This question evaluates understanding of primary keys and related schema constraints in relational databases, measuring competency in data integrity, uniqueness, NULLability, composite keys, and constraint definition within the Software Engineering Fundamentals domain.

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Question

In a relational database, which of the following statements about primary keys is incorrect?

Options:

A. Every column that is part of the primary key must be NOT NULL.
B. Every column that is part of the primary key must be unique.
C. A table can define only one primary key.
D. Primary keys can be defined at either the table level or the column level.

Identify incorrect statement about primary keys

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Identify incorrect statement about primary keys

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