What conditions allow a relation's attribute to have a changeable length?
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What conditions allow a relation's attribute to have a changeable length?
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- What constraint is imposed on am attribute that is declared as Primary Key? What bemefit does that constraint provide?How does a relation's primary key affect its attributes' functional dependencies?What is the link between a relation's main key and the functional dependencies among all of its attributes?
- What are the references to the main key in the same relation?Each relationship is mapped into a relation? true or falseThe properties of the relation object can be used to implement the master-detail functionality which most appropriate for your application. You can delete a master-detail relation by selecting it in the Object Navigator and choosing Navigator => Delete. Discuss the Deletion of Relations in detail.