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Database Design Give one example of a cardinality ratio for a relationship of degree five.

Database Design

Give one example of a cardinality ratio for a relationship of degree five.

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Expert Solution

Cardinality Ratio:

   As we all know that the relationship in an ER model is nothing but the assosiation among the entities which belongs to one or more entity sets. Now cardinality ratio means that the maximum number of entities of one particular entitiy set which are associated with the maximum number of entities of other entity set. There are of 3 types in the degree of relationship.

i) One-to-one

ii) One-to-many

iii) Many-to-many

For the ratio of degree 5 we need to go for either One to many or Many to many. Now let us see. For example let us consider university entity, students, faculty, department, projects. Now let us map the relation.

  • Here, we have taken 5 entities. Because the degree is nothing but the number of entities we have taken.

venereology answered 1 day ago
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