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A relationship set is a set of relationships of the similar type.
For example, let consider the relationship among two entities sets course and student. Collection of all the instances of relationship opts forms a relationship set known as relationship type.
Degree
The degree of a relationship type is the number of participating entity types.
The relationship among two entities is known as binary relationship. A relationship among three entities is known as ternary relationship.
Likewise relationship between n entities is called n-ry relationship.
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Cardinality of Relationship One-to-One Only one entity of the first set is linked to only one entity of the second set. E.g. A teacher teaches a student. Only one teacher
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