03 Entity Relationship Modelling

Fill in the blank:
"The focus is on the ______ rather than on the process"

• key
• data
• cell
• model

What are the two perspective that the data model can be derived?

• Top Down & Bottom-up
• Up Down & Down up
• Left Right & Right Left
• Left Side & Right Side

What model(s) did we learn about in class?

• Chen Model
• Crows Foot Model
• Chen & Crows Foot
• None of these

What is an Entity? 

• Person or place.
• Association between the instances 
• Named Property or characteristic
• Person, Place, Object, event or concept about which the data is to be maintained

What is a relationship? (Chens Notation)

• Person, Place, Object, event or concept about which the data is to be maintained
• Association between the instances 
• Named Property or characteristic
• The next important link

What is an Attribute?

• Person, Place, Object, event or concept about which the data is to be maintained
• Association between the instances 
• Named Property or characteristic
• The next important link

Is "Next_of_kin" a weak entity type or strong entity type?

• Weak
• Strong

What is a Strong entity type?

• An entity type that is existence dependent
• An entity type that is not existence-dependent on some other entity type
• An entity type that is quicker to link
• An entity type that is slower to link

Which of these is  an example of an Attribute for Student

• Student_ID
• Doors
• Model

Is a Candidate key an identifier attribute?

• Yes
• No