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Explain Superkey
Ans: A superkey is described in the relational model of database organization like a set of attributes of a relation variable for which it holds that in all relations assigned to that variable there are no two different tuples (rows) that have similar values for the attributes in this set. Consistently a superkey can as well be defined as a set of attributes of a relvar upon that all attributes of the relvar are functionally dependent.
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What is foreign key? A relation schema r1 derived from an ER schema may contain among its attributes the primary key of another relation schema r2.this attribute is known as a
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What is an ERD?
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