Question: 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-to-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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