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What is Functional Dependency?
A Functional dependency is shown by X Y among two sets of attributes X and Y that are subsets of R specifies a constraint on the possible tuple that can form a relation state r of R. The constraint is for any two tuples t1 and t2 in r if t1[X] = t2[X] then they have t1[Y] = t2[Y]. This means the value of X component of a tuple uniquely verifies the value of component Y.
To delete a particular column in a relation which command is used ? To delete a particular column in a relation ALTER command is used.
what is er digram given that example of hospital,bank and library er digram.
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explain exhaustively the problems associated with ER diagrams. include illustrations in your answer
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