Question 2. Analyze a Supertype/Subtype ERD (A Subset of a Publisher Database ERD)

Question 2. Analyze a Supertype/Subtype ERD (a subset of a Publisher database ERD)

a. List the attributes for Author. List the attributes for Employee. b. For each entity in the diagram, state whether it is a supertype, a subtype, or neither. c. Answer the questions below:  Can an employee also be an author?  Can a person be neither an employee nor an author? d. Assume there is a “manages” relationship in which an Employee manages an Author. State the business rules for the relationship. Modify the ERD to reflect this relationship. Hints: A single attribute may have only one FK constraint. An FK attribute does not have to have the same name as its referenced PK.

Question 3. Create an ERD

A Diagnostic Radiology Service provides Radiology Procedures for outpatients. Use the entity descriptions and Business Rules described below to develop an ERD. Please break attributes such as Name and Address into the appropriate atomic fields. Please identify PK and FK attributes, Supertype/Subtype Hierarchy Constraints, and all relationships within the ERD. An entity type list follows. Attributes are in parentheses, and each PK attribute is underlined.

Person (PersonID, Name, Address, HomePhone, CellPhone, Gender, Race)

ReferringPhysician (PersonID, NationalPractitionerID, Specialty)

Patient (PersonID,ReferringPhysicianID)

Employee (EmployeeID, Name, Address, NationalIDNumber, DateHired, DateLastPromotion, Degree, HourlyRate)

Technician (EmployeeID,Certification)

Radiologist (EmployeeID,Specialty)

Visit (PatientID, Date, Reason for Visit)

Procedure (ProcedureID, ProcedureName, Description)

Person is a supertype, with subtypes ReferringPhysician and Patient. A Person is not employed by the organization. A Person must be at least one of the following: Referring Physician or Patient. A Person can be both.

Employee is a supertype, with subtypes Technician and Radiologist. An Employee is a Technician or a Radiologist or an Administrative Staff. (Administrative Staff entity type is not to be included in the ERD.)

Here are the business rules for the binary relationships:

Patient – ReferringPhysician

A Referring Physician has many Patients.

A Patient has one and only one Referring Physician.

ReferringPhysician 1:M Patient

Patient – Visit

A Patient may have many Visits.

A Visit relates to one and only one Patient.

Patient 1:M Visit Visit – RadiologyProcedure

A Visit may contain many Radiology Procedures

A Radiology Procedure is performed for many Visits

Visit M:N RadiologyProcedure; Associative Entity VisitProcedure

Radiologist – VisitProcedure

A Radiologist reads many VisitProcedure results

The VisitProcedure result is read by one Radiologist

Radiologist 1:M VisitProcedure

Technician – VisitProcedure

A Technician performs many VisitProcedures

A VisitProcedure is performed by one Technician

Technician 1:M VisitProcedure