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DBI202 LAB2 Dinhchinh - fdsdfsdfdsd
database (Trường Đại học FPT)
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Name: Thái Đình Chinh
Student ID: DE170147
Class: SE17C01
Subject: DBI202
Lab 2: FD
Ex1: 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.
Your task is making the database to 3NF (specify step by step: determine FDs, normalization,..).
TechN
o
TechNa
me
DeptI
d
Departme
nt
JobN
o
Date
SchoolI
D
School
Hourswork
ed
298
Walls, Ian
1
Engineerin
g
1002
12/9/0
7
192
Beauty
2.5
298
Walls, Ian
1
Engineerin
g
1003
12/9/0
7
125
Computi
ng
5.5
345
Smith,
Alan
2
Helpdesk
1002
12/9/0
7
192
Beauty
3
345
Smith,
Alan
2
Helpdesk
3440
18/9/0
7
346
Bus &
Man
1.5
345
Smith,
Alan
2
Helpdesk
1480
15/9/0
7
192
Beauty
3
380
Jackson,
Bob
3
Labs
3670
19/9/0
7
560
Design
4
380
Jackson,
Bob
3
Labs
3440
18/9/0
7
346
Bus &
Man
2
300
Jones, Joe
2
Helpdesk
1450
15/9/0
125
Computi
1
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7
ng
300
Jones, Joe
2
Helpdesk
1480
15/9/0
7
192
Beauty
3
320
Young,
Jill
3
Labs
3440
18/9/0
7
346
Bus &
Man
4
320
Young,
Jill
3
Labs
1002
12/9/0
7
192
Beauty
2.5
320
Young,
Jill
3
Labs
3670
19/9/0
7
560
Design
2
EX1:
- To normalize the given database to 3NF (Third Normal Form), we need to follow the steps of
normalization:
- Step 1: Identify the functional dependencies (FDs) From the given data, we can identify
the following functional dependencies:
 TechNo => TechName, DeptId
 DeptId => Department
 JobNo, Date => Hoursworked
 SchoolID => School
- Step 2: Create the initial table structure Based on the identified functional dependencies,
we can create the initial table structure:
 Table 1: Staff
TechNo
TechName
DeptId
298
Walls, Ian
1
345
Smith, Alan
2
380
Jackson, Bob
3
300
Jones, Joe
2
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320
Young, Jill
3
 Table 2: Departments
DeptId
Department
1
Engineering
2
Helpdesk
3
Labs
 Table 3: Jobs
JobNo
Date
Hoursworked
1002
12/9/07
2.5
1003
12/9/07
5.5
3440
18/9/07
1.5
1480
15/9/07
3
3670
19/9/07
4
1450
15/9/07
1
 Table 4: Schools
SchoolID
School
192
Beauty
125
Computing
346
Bus & Man
560
Design
- Step 3: Apply the first normalization form (1NF) To achieve 1NF, we need to eliminate
repeating groups and ensure that each column contains only atomic values.
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=> The initial table structure already satisfies the requirements of 1NF.
- Step 4: Apply the second normalization form (2NF) To achieve 2NF, we need to eliminate
partial dependencies.
 Table 1: Staff
TechNo
TechName
DeptId
298
Walls, Ian
1
345
Smith, Alan
2
380
Jackson, Bob
3
300
Jones, Joe
2
320
Young, Jill
3
 Table 2: Departments
DeptId
Department
1
Engineering
2
Helpdesk
3
Labs
 Table 3: Jobs
JobNo
Date
Hoursworked
1002
12/9/07
2.5
1003
12/9/07
5.5
3440
18/9/07
1.5
1480
15/9/07
3
3670
19/9/07
4
1450
15/9/07
1
 Table 4: Schools
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SchoolID
School
192
Beauty
125
Computing
346
Bus & Man
560
Design
 Table 5: StaffJobs
TechNo
JobNo
298
1002
298
1003
345
1002
345
3440
345
1480
380
3670
380
3440
300
1450
300
1480
320
3440
320
1002
320
3670
 Table 6: JobSchools
JobNo
SchoolID
1002
192
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1003
125
3440
346
1480
192
3670
560
1450
125
- Step 5: Apply the third normalization form (3NF) To achieve 3NF, we need to eliminate
transitive dependencies.
 Table 1: Staff
TechNo
TechName
298
Walls, Ian
345
Smith, Alan
380
Jackson, Bob
300
Jones, Joe
320
Young, Jill
 Table 2: Departments
DeptId
Department
1
Engineering
2
Helpdesk
3
Labs
 Table 3: Jobs
JobNo
Date
Hoursworked
1002
12/9/07
2.5
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1003
12/9/07
5.5
3440
18/9/07
1.5
1480
15/9/07
3
3670
19/9/07
4
1450
15/9/07
1
 Table 4: Schools
SchoolID
School
192
Beauty
125
Computing
346
Bus & Man
560
Design
 Table 5: StaffJobs
TechNo
JobNo
298
1002
298
1003
345
1002
345
3440
345
1480
380
3670
380
3440
300
1450
300
1480
320
3440
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320
1002
320
3670
 Table 6: JobSchools
JobNo
SchoolID
1002
192
1003
125
3440
346
1480
192
3670
560
1450
125
=> The normalized tables are now in the 3NF. Each table contains non-redundant
information, and there are no transitive dependencies or repeating groups.
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