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What is a Primary Key, and why is it important? What is a one - to - many relationship in a relational database? Give an

What is a Primary Key, and why is it important?

What is a one

-

-

many relationship in a relational database? Give an example with your answer.

What is the referential integrity rule?

What is the entity integrity rule?

The referential integrity rule can act as a preventive control. Provide an example of a business rule that can be enforced via referential integrity.

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