Cardinality of Relationship.

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Cardinality  is define as number of entities from an entity set related with other number of entities from an entity set. 
On the basis of cardinality we have following three types.

1. One to One : In one to one relationship exactly one entity from an entity set is related with exactly one entity from another entity set.

 
2. One to many : In this type of relationship exactly one entity from an entity set is related with many entities from another entity set.



3. Many to many :  In this type of relationship many entities from an entity set is related with many entities from another entity set. 



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