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1- What is a foreign key constraint- Why are such constraints importan.pdf

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The document discusses the significance of foreign key constraints and their role in maintaining referential integrity within databases. It also explains the distinctions between external, internal, and conceptual schemas, highlighting their relationship to logical and physical data independence. These concepts are crucial for understanding database design and management.

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1. What is a foreign key constraint? Why are such constraints important? What is referential integrity? (10 pts) 2. Explain the difference between external, internal, and conceptual schemas. How are these different schema layers related to the concepts of logical and physical data independence? (10 pts)

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1- What is a foreign key constraint- Why are such constraints importan.pdf

  • 1. 1. What is a foreign key constraint? Why are such constraints important? What is referential integrity? (10 pts) 2. Explain the difference between external, internal, and conceptual schemas. How are these different schema layers related to the concepts of logical and physical data independence? (10 pts)