Multivalued Dependency - Definitions

Definitions

full constraint
A constraint which expresses something about all attributes in a database. (In contrast to an embedded constraint.) That a multivalued dependency is a full constraint follows from its definition,as where it says something about the attributes .
tuple-generating dependency
A dependency which explicitly requires certain tuples to be present in the relation.
trivial multivalued dependency 1
A multivalued dependency which involves all the attributes of a relation i.e.. A trivial multivalued dependency implies, for tuples and, tuples and which are equal to and .
trivial multivalued dependency 2
A multivalued dependency for which .

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