Inclusion Dependency In DBMS

Although less prevalent than functional dependency, join dependency and multivalued dependency can guide the design of the database. But inclusion dependency is widespread. It is a statement in which a few of the columns of a relation are in the other columns. Typically, inclusion dependency has a very insignificant influence on the design of a database. For example, a foreign key is inclusion dependency.

Explanation of inclusion dependency

Let there be the relations S and R that was acquired by the translation of entity sets so that every S entity is an R entity.

  • Inclusion dependency occurs when the relation obtained by the projection of S on the key attributes is the same as that retrieved from R. There should be no splitting up of the collections of attributes that take part in the inclusion dependency.
  • Generally, the inclusion dependencies are based on keys.


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