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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.
What are the three classes of SQL expression? SQL expression consists of three clauses: Select From Where
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Explain Data Dictionary in short?
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Enumerate or state the steps in creating a relevant database of a shop.
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