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Define the Canonical cover
Ans: A canonical cover Fc for F is a set of dependencies like F logically implies all dependencies in Fc, and Fc logically entails all dependencies in F. Fc must have the subsequent properties:
Fc is minimal in certain sense - it does not consist of extraneous attributes, and it combines functional dependencies with similar left side. It is cheaper to test Fc than it is to test F itself.
what is correlation in nested query
Creating views with check option : This option limits those updates of data values that cause records to go off the view. The following instance tells this in more detail: Examp
er diagtram for icici
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Explain the conventions (relationships) for displaying an ER schema as an ER diagram.
What is the used of specifying alias? Specifying alias: is used to rename column or attribute in a table.
Describe the shadow paging technique.
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