What is join dependency and inclusion dependency?

What is join dependency and inclusion dependency?
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1 Answer

Answer :

Join Dependency:
A Join dependency is generalization of Multivalued dependency.A JD {R1, R2, …,Rn} is said to  hold over a relation R if R1, R2, R3, …, Rn is a lossless-join decomposition of R . There is no set of  sound and complete inference rules for JD.
Inclusion Dependency:
An Inclusion Dependency is a statement of the form that some columns of a relation are  contained in other columns. A foreign key constraint is an example of inclusion dependency.
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