Multivalued Dependencies is different from Functional Dependencies because it required that certain tuples be present in a relation. So, it is a special case of tuple-generating dependency.
In database theory ,it is full constraint between two sets of attributes in a relation. It plays a role in the 4NF database normalization.
For an Example:
R is a relational set with attribute A, B, and C
So Multivalued dependency occurs when relation R has attribute A, B and C such that
A determines a set of values for B,
A determines a set of values for C, and
B and C are independent of each other.
Then we can write:
A -->> B and A -->> C
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