Describe the concept of functional dependency.
What will be an ideal response?
Functional dependency describes the relationship between attributes in a relation. For example, if
A and B are attributes of relation R, B is functionally dependent on A (denoted A ? B), if each
value of A in R is associated with exactly one value of B in R.
Functional dependency is a property of the meaning or semantics of the attributes in a relation.
The semantics indicate how the attributes relate to one another and specify the functional
dependencies between attributes. When a functional dependency is present, the dependency is
specified as a constraint between the attributes.
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