1z0-071 Exam Dumps | Which two statements are true about Entity Relationships?

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Question 63/144

Which two statements are true about Entity Relationships?

A. A Relationship can be mandatory for both entities

B. A one-to-one relationship is always a self-referencing relationship

C. A many-to-many relationship can be implemented only by using foreign keys

D. A table name can be specified just once when selecting data from a table having a selfreferencing relationship

E. A one-to-many relationship in one direction is a one-to-one relationship in the other direction

Correct Answer: A

A relationship in an Entity-Relationship (ER) model can indeed be mandatory for both entities, meaning that an instance of one entity must relate to one and only one instance of another entity, and vice versa. This is commonly seen in a one-to-one relationship where both sides are mandatory.
Option B is incorrect; a one-to-one relationship does not have to be self-referencing. Self-referencing (or recursive) relationships occur when an entity has a relationship with itself.
Option C is incorrect; a many-to-many relationship typically requires a join table or associative entity with foreign keys that reference the primary keys of the two entities it connects.
Option D is incorrect; in the case of a self-referencing relationship, you may need to use aliases to specify the table more than once to differentiate between the self-referenced columns.
Option E is incorrect because a one-to-many relationship in one direction does not equate to a one-to-one relationship in the opposite direction.
Reference:
Entity-Relationship Model Concepts: ER Model

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