Question at position 16 What does a "relationship" in an ERD represent?A specific attribute within an entityThe primary attribute of an entityAn association between two or more entitiesThe unique identifier of an entity

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BlackTom AI · Accepted Answer

The question asks: What does a 'relationship' in an ERD represent? 
Option 1: 'A specific attribute within an entity' — This describes an attribute, not a relationship. Attributes are properties of an entity (like name, ID), whereas a relationship connects entities. This option confuses the concept of attributes with relationships. 
Option 2: 'The primary attribute of an entity' — The primary attribute would be part of an entity's set of attributes, often designated as a key. It is still an attribute of a single entity, not a link between entities. This misinterprets what a relationship signifies in an ERD. 
Option 3: 'An association between two or more entities' — This accurately captures the meaning of a relationship in an ERD: it describes how entities relate to each other, potentially including cardinality and participation. This is the core purpose of relationships in the diagram. 
Option 4: 'The unique identifier of an entity' — This refers to a primary key or unique attribute of one entity, which is an attribute, not a relationship. It does not express the linkage between entities that a relationship denotes. 
Overall, the incorrect options describe attributes or keys, which are properties of a single entity, while the correct concept in an ERD is the association that connects entities. The distinction hinges on whether we are describing a property of one box (attribute/key) versus the link between boxes (relationship).

Question at position 16 What does a "relationship" in an ERD represent?A specific attribute within an entityThe primary attribute of an entityAn association between two or more entitiesThe unique identifier of an entity

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Question at position 16 What does a "relationship" in an ERD represent?A specific attribute within an entityThe primary attribute of an entityAn association between two or more entitiesThe unique identifier of an entity

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类似问题

In an ER diagram, the weak entity is typically depicted with a _________ ___________, and the relationship between the weak entity and the strong entity is shown with a __________ ___________.

In the following diagram, which of the answers below is true?

Identify the minimum cardinality of any E-R Diagram relationship:

In an ER-Diagram, relationship cardinality is represented as a:

in ERDplus a label:

A pair of perpendicular (crossing) lines across a relationship line, next to an entity, indicates that:

Observe the ER Diagram for the ABC Retailer: Which of the following is true according to the ABC Retailer ER diagram?

Question at position 49 In an ERD, cardinality specifiesThe range of allowable values for an attributeThe unique identifier for an entityThe minimum and maximum number of instances of one entity that can be associated with instances of another entityThe number of attributes within an entity

更多留学生实用工具

希望你的学习变得更简单

In an ER diagram, the weak entity is typically depicted with a ___ _, and the relationship between the weak entity and the strong entity is shown with a _____.