What is a relationship, and what three types of relationships exist? Provide a real world/application example for each of the three types of relationships.
A relationship is a connection or association between two or more entities. In mathematics, a relationship is a rule that maps elements from one set to elements of another set.
There are three main types of relationships:
- Functional relationships:Â A functional relationship is a relationship where each element in the first set is associated with exactly one element in the second set. For example, the relationship between a person’s name and their age is a functional relationship.
- Non-functional relationships:Â A non-functional relationship is a relationship where each element in the first set may be associated with zero, one, or more elements in the second set. For example, the relationship between a person’s name and their friends is a non-functional relationship.
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