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Texas A & M University Foreign Key Constraints and DBMS Questions

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I’m working on a computer science question and need an explanation and answer to help me learn.

1.How can the key and foreign key constraints be enforced by the DBMS? Is the enforcement technique you suggest difficult to implement? Can the constraint checks be executed in an efficient manner when updates are applied to the database?

2.What is the FUNCTION operation? For what is it used? And Present a practical example/ scenario.