Functional dependency ( $X \to Y$ )

A database integrity constraint saying that any two database tuples agreeing on database attributes

X

also agree on database attributes

Y

.

Table of contents
- Attribute closure Functional dependency

Attribute closure ( $X^{+}$ )

The set of database attributes determined by

X

under given functional dependencies. Start from

X

and repeatedly add the right-hand side of each functional dependency whose left-hand side is already included.

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