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In an E-R diagram, it is possible that an entity can have a relationship to itself.Question 36Select one:TrueFalse

Question

In an E-R diagram, it is possible that an entity can have a relationship to itself.

Select one:
True
False

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Solution

Answer

The statement is True.

Explanation

In an Entity-Relationship (E-R) diagram, entities can indeed have relationships with themselves. This type of relationship is referred to as a recursive relationship or self-referencing relationship. Such relationships are useful when an entity type needs to relate to itself in some capacity.

For example, consider an entity called Employee; an employee may serve as a manager for other employees within the same entity. This creates a hierarchical structure where one instance of the entity (an employee) can relate to other instances of the same entity (subordinate employees). In an E-R diagram, this is typically represented by a loop or line that connects the entity back to itself, often with a label indicating the nature of the relationship (e.g., "manages").

This capability allows for modeling complex scenarios in databases where entities can have intricate interrelations, thereby providing a more complete representation of data relationships within the database schema.

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