If the attribute (B) is functionally dependent on a composite key (A) but not on any subset of that composite key, the attribute (B) is fully functionally dependent on (A).

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This statement defines the condition for full functional dependency, which requires that the dependent attribute is only determined by the entire composite key and not by any subset of it. Therefore, if attribute B meets this criterion, it is fully functionally dependent on A.

If the Attribute (B) Is Functionally Dependent on a Composite