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

Question

BlackTom AI · Accepted Answer

Question restatement: In the diagram, determine which of the following statements about the ownership relationship between Person and Vehicle is true.

Option 1: 'Each person owns one or more vehicles. Each vehicle is owned by one or more people.' This implies that a vehicle can have multiple owners, which would be a many-to-many ownership. The diagram does not show multiple people owning the same vehicle, so this is incorrect.

Option 2: 'Each person owns one or more vehicles. Each vehicle is owned by one and only one person.' This matches a one-to-many relationship from Person to Vehicle: a person can own multiple vehicles, but each vehicle has a single owner. The diagram supports a single-owner constraint on the Vehicle side, making this correct.

Option 3: 'Each person owns one and only one vehicle. Each vehicle is owned by one or more people.' This describes a one-to-one or one-to-many flexibility for vehicles but still allows multiple owners per vehicle, which contradicts the typical single-owner constraint shown. Since the diagram indicates ownership is not shared, this is incorrect.

Option 4: 'Each person owns one and only one vehicle. Each vehicle is owned by one and only one person.' This would be a strict one-to-one relationship, where every person has exactly one vehicle and every vehicle has exactly one owner. The diagram allows a person to own multiple vehicles, so this is incorrect.

Summary: The only option that aligns with the depicted relationship—multiple vehicles per person and a single owner per vehicle—is Option 2.

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

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

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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 __________ ___________.

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

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

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 _____.