DFDs and ERDs

What entity type is used in the given diagram?

• STUDENT
• DOCTOR
• EMPLOYEE
• COURSE

Diamond shape is symbol for ?

• Entity

• Cardinality

• Relationship

• Atribut

This shape is symbol for ?

• Attribute

• Relationship

• Entity

• Cardinality

For ERD this shape describe for ?

• Cardinality

• Relationship

• Attribute

• Entity

_________is a person, place, object, event or concept in the user environment about which company wishes to maintain the data

• attribute
• entity
• relationship
• none of these

Which attribute is the PRIMARY KEY?

• EmpID
• Degree
• Name
• Birthday

An entity ____________.

• Is the association between two related processes

• Has cardinality (1:1, 1:N, or M:N)

• Shows if it can be null or no null

• Is a person, place or thing

• Is described with a verb phrase

What are the components of an E-R model?

• Entity

• Attributes

• Relationship

• All the above

Which would NOT likely be an attribute of an entity called “Student”?

• Age

• Student identification number

• Class room number

• Home phone

• Gender

The term _____ is used to refer a row

• Record

• Primary key

• Foreign key

• Field