1z0-071 Exam Dumps | Which three are key components of an Entity Relationship Model?

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Question 81/139

Which three are key components of an Entity Relationship Model?

A. a table

B. an attribute

C. a unique identifier

D. an activity

E. a relationship

F. an entity

Correct Answer: B,E,F

Key components of an Entity-Relationship Model (ERM) include:
* B. an attribute: Attributes are properties or characteristics of an entity, such as a person's name, date of birth, etc., and are essential in describing the data aspects of an entity in an ER model.
* E. a relationship: Relationships describe how entities interact with each other within the database structure, such as a customer placing an order.
* F. an entity: Entities are the key components of an ER model, representing objects or things within the domain that have a distinct existence, like 'Customer' or 'Order'.
Incorrect options:
* A: A table is a database structure used to implement an entity in relational databases, not a component of the ER model itself.
* C: While unique identifiers are crucial in database implementation (typically as primary keys), they are a specific attribute type, not a general component of ER models.
* D: An activity is not a component of an ER model; activities relate more to process models or behavioral models in systems design.

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