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Data Modeling Concepts: TMF2034 Database Concept and Design 1 Quiz

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Data Modeling Concepts: TMF2034 Database Concept and Design 1 Quiz

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Questions and Answers

What is the purpose of the Entity Relationship Model (ERD)?

To create a relational table for each entity instance

To define the basic structure of a database system

To model the graphical representation of entities and their relationships in a database structure (correct)

To establish primary keys for all entities

In data modeling, what does a strong (identifying) relationship signify?

The relationship is identifying for only one entity involved

The relationship is non-mandatory for all entities involved

The relationship is non-identifying for all entities involved

The relationship is mandatory for one or more entities involved (correct)

What does the term 'composite entity' refer to in data modeling?

An entity that is part of a complex relationship (correct)

An entity that serves as a primary key for other entities

An entity that has a weak relationship with other entities

An entity that represents a many-to-many relationship

What is the primary function of connectivity labels in an Entity Relationship Diagram (ERD)?

To show the type of relationships between entities Signup and view all the answers

How does the strength of a relationship between entities impact database design?

It influences the choice of primary keys for the entities involved Signup and view all the answers

In a weak (non-identifying) relationship, what does the primary key of the related entity not contain?

A primary key component of the parent entity Signup and view all the answers

Which condition must a weak entity meet to be considered existence-dependent?

It cannot exist without the entity with which it has a relationship Signup and view all the answers

What is a characteristic of a weak entity's primary key in relation to the parent entity?

It is always inherited entirely from the parent entity's primary key Signup and view all the answers

What is depicted by the Specialization Hierarchy in an Extended Entity Relationship Model (EERM)?

Relationships described in terms of 'is-a' relationships Signup and view all the answers

What does the Extended Entity Relational Model (EERM) result from?

The addition of more semantic constructs to the original ER model Signup and view all the answers