Give an example that maintains a unary relationship
Question
Give an example from your daily life. Of an entity that maintains a unary relationship with itself. Please describe the entity and the relationship. In English statements and show an ER diagram that describes the entity. And its attributes and the unary relationship incorrect ER notation.
Summary
In the given question we have to show an ER diagram that describes the entity. And its attributes and the unary relationship incorrect ER notation. Also, we will take an example from our daily life of an entity that maintains a unary relationship with itself.
Explanation
In this ER diagram, we will take a person as an entity. So a person has various different attributes such as his name, Surname, middle name, date of birth, nationality, Aadhar number and many more.
We can say that when there is the same entity in both the classes or both things then it is called a unary relationship.
And in our country governor governs the nationality to the person. So this is one kind of relationship. And next is One governor governs many people. So this is one to many relationship. And this relationship will be useful in our ER diagram.
In this diagram we have:
| Entity | Person |
| Attributes | Aadhar_No, PK First_name last_name mid_name date_of_birth Nationality |
| Relation | Governs |
The ER diagram for this relationship will be:
Also read, Creating an ER diagram for a class and stuck on what entities I can create.
