Question: is where, within a relation R , an attribute B is functionally dependent on an attribute A if and only if a given value of

is where, within a relation R

,

an attribute B is functionally dependent on an attribute A if and only if a given value of attribute A determines exactly one value of attribute B; saying that the relationship

"

B is dependent on A

"

is equivalent to "A determines B

"

and is written as AB

.

.

Functional independence

.

Normal dependence

.

Abnormal dependence

.

Functional dependence

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