CSCI 4707 – Chapter 5 (week 4) Understanding Entity Relationship Diagrams Group 12: Alyssa DeWind and Jacob Wagener

Question 1 In the crow’s foot notation, entity types are denoted by: a.Crow feet b.Boxes c.Diamonds d.Circles

Question 2 In crow’s foot notation, crow feet with 3 claws represent: a.Entity types b.Relationship type c.Maximum cardinality d.Maximum cardinality greater than 1

Question 3 Which of the following is usually depicted in entity relationship diagrams? a.Maximum cardinality constraints for relationships b.Domain integrity constraints for all attributes c.“NOT NULL” integrity constraints associated for all attributes d.“UNIQUE” integrity constraints associated for all attributes

Question 4 Which statement is not true regarding inheritance in a generalization hierarchy? a.The attributes of a supertype apply to all subtypes b.Every subtype entity is also a supertype entity c.Attributes inherited from a supertype are shown in an ERD d.All of the above

Question 5 A relationship involving more than two entity types is: a.A recursive relationship b.A binary relationship c.An M-way relationship d.Is illegal in an entity relationship diagram

Discussion Questions Why is classification important in business? -> Classification allows for efficient communication among business stakeholders. It also ensures ensures that a standard set of rules can be followed by the organization. What are the limitations of the diagram rules? -> The diagram rules do not ensure that multiple alternatives have been pursued, the user requirements are met, or that the proper documentation has been completed. (pg 144 for both answers)