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A role is a collection of related system and object privileges that you can grant to the user and other roles. Questions: Why do we

A role is a collection of related system and object privileges that you can grant to the user and other roles.

Questions:

Why do we need to use roles?

How to grant privilege (such as CREATE SESSION) to a role?

How to grant role to a user?

How to revoke a role from a user?

Please make sure to answer each of the question.

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