Podcast
Questions and Answers
What is the purpose of the Entity Relationship Model (ERD)?
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?
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?
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)?
What is the primary function of connectivity labels in an Entity Relationship Diagram (ERD)?
How does the strength of a relationship between entities impact database design?
How does the strength of a relationship between entities impact database design?
In a weak (non-identifying) relationship, what does the primary key of the related entity not contain?
In a weak (non-identifying) relationship, what does the primary key of the related entity not contain?
Which condition must a weak entity meet to be considered existence-dependent?
Which condition must a weak entity meet to be considered existence-dependent?
What is a characteristic of a weak entity's primary key in relation to the parent entity?
What is a characteristic of a weak entity's primary key in relation to the parent entity?
What is depicted by the Specialization Hierarchy in an Extended Entity Relationship Model (EERM)?
What is depicted by the Specialization Hierarchy in an Extended Entity Relationship Model (EERM)?
What does the Extended Entity Relational Model (EERM) result from?
What does the Extended Entity Relational Model (EERM) result from?
