10 Questions
What is the purpose of the Entity Relationship Model (ERD)?
To model the graphical representation of entities and their relationships in a database structure
In data modeling, what does a strong (identifying) relationship signify?
The relationship is mandatory for one or more entities involved
What does the term 'composite entity' refer to in data modeling?
An entity that is part of a complex relationship
What is the primary function of connectivity labels in an Entity Relationship Diagram (ERD)?
To show the type of relationships between entities
How does the strength of a relationship between entities impact database design?
It influences the choice of primary keys for the entities involved
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
Which condition must a weak entity meet to be considered existence-dependent?
It cannot exist without the entity with which it has a relationship
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
What is depicted by the Specialization Hierarchy in an Extended Entity Relationship Model (EERM)?
Relationships described in terms of 'is-a' relationships
What does the Extended Entity Relational Model (EERM) result from?
The addition of more semantic constructs to the original ER model
Test your knowledge of data modeling concepts covered in TMF2034 Database Concept and Design 1. This quiz covers topics such as translating M:M relationship into a composite entity, understanding strong and weak relationships, adopting EERM into database conceptual design, selecting good primary keys, DBMS integrity, using entity clusters, and flexible solutions for special data-modeling cases.
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