Lab 2
Normal forms and ERD
Exercise 1. You have been given a form which shows the details of technical jobs carried out
for different schools by members of staff in the local college. You will note that one job may
require input from more than one member of staff. Each member of staff belongs to a department
within the college and the number of hours worked on each job along with the date the job was
undertaken are noted. A member of staff may work on more than one job on any given date.
The college would like to set up a relational database to manage the allocation of staff to jobs
and keep a more efficient record of the number of hours worked for each school within the
college.
a. Give the list of functional dependencies
b. Assume that at the beginning, the database contain only one relation R(TechNo,
TechName, DeptID, Department, JobNo, Date, SchoolID, School, Hoursworked).
Normalize the database to 1NF, 2NF and 3NF (specify your responses step by
step, not only give the results).
TechNo
TechName
DeptId
Department
JobNo
Date
SchoolID
School
Hoursworked
298
Walls, Ian
1
Engineering
1002
12/9/07
192
Beauty
2.5
298
Walls, Ian
1
Engineering
1003
12/9/07
125
Computing
5.5
345
Smith, Alan
2
Helpdesk
1002
12/9/07
192
Beauty
3
345
Smith, Alan
2
Helpdesk
3440
18/9/07
346
Bus & Man
1.5
345
Smith, Alan
2
Helpdesk
1480
15/9/07
192
Beauty
3
380
Jackson,
Bob
3
Labs
3670
19/9/07
560
Design
4
380
Jackson,
Bob
3
Labs
3440
18/9/07
346
Bus & Man
2
300
Jones, Joe
2
Helpdesk
1450
15/9/07
125
Computing
1
300
Jones, Joe
2
Helpdesk
1480
15/9/07
192
Beauty
3
320
Young, Jill
3
Labs
3440
18/9/07
346
Bus & Man
4
320
Young, Jill
3
Labs
1002
12/9/07
192
Beauty
2.5
320
Young, Jill
3
Labs
3670
19/9/07
560
Design
2
Exercise 2. You are required to design a database for storing data of a clinic. For the first time
a patient come to the clinic, he/she is required to fill the following form. Note that the patient
must give a reason for each visit to the clinic.
Patient Consultation Form
Date: ______________________ Time: ______________________
Name: ___________________________ Address: ______________________________________
Phone: ___________________________ Email: ________________________________________
Social Security Number: _______________ Date of Birth _____________ Age ________________
Sex: _________________________ Ocupation: _________________________
Emergency Contact:
Name: _________________________ Relation: ________________ Phone number: ___________
Main reason for today’s visit: ________________________________________________________
In each visit, the patient may be consulted by a main doctor who after may require him/her to do some
tests/consultations and gives him/her a list of medicines to take. Note that each test is done by a doctor
and different tests could be done by different doctors. The information of the tests/consultations and
medicines is as follows:
No
Date
Time
Code
of test
Name
of test
Price
Discount
Result
Code
of
Doctor
Name of
Doctor
Indication
No Code of Name of Unit
medicine medicine
Quantity Unit
Price
Amount Indication Code
of
Doctor
Name
of
Doctor
Now, design a database in BCNF suitable for this clinic.
Exercise 3: Give an ERD for the following system.
300 employees of a company are organized into different departments. For each employee, we
have his social security number, name, address, sex, birthdate, phone and email. Each department
has a name, a role and a head (who is also an employee). Note that each employee works for
only one department at a time, but he could change from one department to another department.
Each time he works for a department, the company signs a contract specifying his salary, start
date and end date. Each department handles several projects (each project is handled by only one
department). Each project has a name, start date, end date, a project manager and a number of
employees who work on it. Note that an employee could work on different projects with a
specified number of hours. Each employee may have several dependents. For each dependent,
we keep track of their name, sex, birthdate and relationship to the employee.
Exercise 3: Give an ERD for the following system.
A hardware store sells several home workshop products to the public (such as power saws and
sanders). Each product has several different manufacturers who manufacture it, and prices are
different for products made by different manufacturers. Each time one or more products are sold
to a customer, an invoice is created which lists the date, items purchased and their prices, and
then the total purchase and tax amounts.