Enhanced Entity Relationship: From ERD to Relational Model Exercise & Answer
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1 Enhanced Entity Relationship: From ERD to Relational Model Exercise & Answer The following is Entity Relationship Model of ABC Medical Centre. Map the Entity Relationship Model into Relational Model. Need to study and properly understand the 7 rules (from mannino book in converting the ERD to Table schemas (relational model. The following SQL script try to cover the whole ERD diagram.
2 Firstly we analyze the generalization part. It is a straight forward and the easiest conversion. CREATE TABLE Doctor( VARCHAR(30, Address VARCHAR(50, Phoneno VARCHAR(20, Salary NUMERIC(20,2, CONSTRAINT PKDoctor PRIMARY KEY ( CREATE TABLE Medical( Overtimerate NUMERIC(4,2, CONSTRAINT PKMedical PRIMARY KEY (, CONSTRAINT FKMedical FOREIGN KEY ( REFERENCES Doctor( ON DELETE CASCADE CREATE TABLE Specialist( Fieldarea VARCHAR(30, CONSTRAINT PKSpecialist PRIMARY KEY (, CONSTRAINT FKSpecialist FOREIGN KEY ( REFERENCES Doctor( ON DELETE CASCADE
3 CREATE TABLE Appointment( Apptno Date Time DATETIME, CONSTRAINT PKAppointment PRIMARY KEY (Apptno, CONSTRAINT FKAppointment FOREIGN KEY ( REFERENCES Doctor(, CONSTRAINT FKAppointment1 FOREIGN KEY (Patientno REFERENCES Patient(Patientno
4 CREATE TABLE Patient( VARCHAR(40, Address VARCHAR(50, PhoneNo VARCHAR(20, CONSTRAINT PKPatient PRIMARY KEY (Patientno
5 CREATE TABLE Payment( Details VARCHAR(60, Method VARCHAR(20, CONSTRAINT PKPayment PRIMARY KEY (Paymentno, CONSTRAINT FKPayment FOREIGN KEY (Patientno REFERENCES Patient(Patientno CREATE TABLE Bill( Total NUMERIC(10,2, CONSTRAINT PKBill PRIMARY KEY (Billno, CONSTRAINT FKBill FOREIGN KEY ( REFERENCES Doctor( CREATE TABLE Pay_Bill(
6 CONSTRAINT PKPay_Bill PRIMARY KEY (Paymentno, Billno, CONSTRAINT FKPaymentno FOREIGN KEY (Paymentno REFERENCES Payment(Paymentno, CONSTRAINT FKBillno FOREIGN KEY (Billno REFERENCES Bill(Billno The cumulative tables are shown below. These are generic SQL scripts. The bold notations are the answer that should be used in exam as relational model. It is just a Functional Dependency (FD notation. CREATE TABLE Doctor( VARCHAR(30, Address VARCHAR(50, Phoneno VARCHAR(20, Salary NUMERIC(20,2, CONSTRAINT PKDoctor PRIMARY KEY ( Doctor(,,, Address, Phoneno, Salary Primary Key CREATE TABLE Medical( Overtimerate NUMERIC(4,2, CONSTRAINT PKMedical PRIMARY KEY (, CONSTRAINT FKMedical FOREIGN KEY ( REFERENCES Doctor( ON DELETE CASCADE Medical(, Overtimerate Primary Key Foreign Key references Doctor( CREATE TABLE Specialist( Fieldarea VARCHAR(30, CONSTRAINT PKSpecialist PRIMARY KEY (, CONSTRAINT FKSpecialist FOREIGN KEY ( REFERENCES Doctor( ON DELETE CASCADE Specialist(, Fieldarea Primary Key Foreign Key references Doctor( CREATE TABLE Appointment( Apptno Date Time DATETIME, CONSTRAINT PKAppointment PRIMARY KEY (Apptno, CONSTRAINT FKAppointment FOREIGN KEY ( REFERENCES Doctor(, CONSTRAINT FKAppointment1 FOREIGN KEY (Patientno REFERENCES Patient(Patientno Appoinment(Appno, Date, Time,, Patientno
7 Primary Key Appno Foreign Key references Doctor( Foreign Key Patientno references Patient(Patientno CREATE TABLE Patient( VARCHAR(40, Address VARCHAR(50, PhoneNo VARCHAR(20, CONSTRAINT PKPatient PRIMARY KEY (Patientno Patient(Patientno,, Address, Phoneno, Primary Key Patientno CREATE TABLE Payment( Details VARCHAR(60, Method VARCHAR(20, CONSTRAINT PKPayment PRIMARY KEY (Paymentno, CONSTRAINT FKPayment FOREIGN KEY (Patientno REFERENCES Patient(Patientno Payment(Paymentno, Details, Method, Patientno Primary Key Paymentno Foreign Key Patientno references Patient(Patientno CREATE TABLE Bill( Total NUMERIC(10,2, CONSTRAINT PKBill PRIMARY KEY (Billno, CONSTRAINT FKBill FOREIGN KEY ( REFERENCES Doctor( Bill(Billno, Total, Primary Key Billno Foreign Key references Doctor( CREATE TABLE Pay_Bill( CONSTRAINT PKPay_Bill PRIMARY KEY (Paymentno, Billno, CONSTRAINT FKPaymentno FOREIGN KEY (Paymentno REFERENCES Payment(Paymentno, CONSTRAINT FKBillno FOREIGN KEY (Billno REFERENCES Bill(Billno Pay_Bill(Paymentno, Billno Primary Key Paymentno, Billno Foreign Key Paymentno references Payment(Paymentno Foreign Key Billno references Bill(Billno
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