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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,

1. What is a foreign key constraint? Why are such constraints important? What is referential integrity? (10

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 Foreign Key Constraint and Referential Integrity A foreign key constraint is a rule that is applied to a set of one or more columns in a database table It establishes a link between the data in two ... blur-text-image

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