4.13

Consider a view v whose definition references only relation r. * If a user is granted select authorization on v, does that user need to have select authorization on r as well? Why or why not?
* If a user is granted update authorization on v, does that user need to have update authorization on r as well? Why or why not?
* Give an example of an insert operation on a view v to add a tuple t that is not visible in the result of select * from v. Explain your answer.

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• No. This allows a user to be granted access to only part of relation r.

• Yes. A valid update issued using view v must update r for the update to be stoared in the database.

• Any tuple t compatible with the schema for v but not satisfying the where clause in the definiton of view v is a valid example. ONe such example appears in Section 4.2.4.