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Explain Foreign Key?
Foreign Key - Let there are two relations (tables) R and S. Any candidate key of the relation R that is referred within the relation S is known as the foreign key within the relation S and referenced key in the relation R. The relation R is also known as parent table and relation S is also known as child table.
What is a primary key? Primary key is chosen by the database designer as the principal means of identifying an entity in the entity set.
What is indexed sequential file organization? What are the applications of this organization? Ans: An index file can be employed to effectively overcome the problem of storing
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