Question: Among the advantages of using a relational database is enforcing business rules. Based on your understanding of how the structure of a relational database helps

Among the advantages of using a relational database is enforcing business rules. Based on your understanding of how the structure of a relational database helps prevent data redundancy and other advantages, how does the primary key/foreign key relationship structure help enforce a business rule that indicates that a company shouldn’t process any purchase orders from suppliers who don’t exist in the database?

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