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What are the differences between base relations and virtual relations?Explain with an example each. (2) How does SQL facilitate implementation of the entity integrity constraint

What are the differences between base relations and virtual relations? Explain with an example each.

(2) How does SQL facilitate implementation of the entity integrity constraint and referential integrity constraint in a relational database? Explain with an example.

(3)

(i) Explain the difference between a key and a superkey.

(ii) Why do we designate one of the candidate keys of a relation to be the primary key?

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