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Database Normalization
This task is about normalizing table of a database system. The following are the two tables:
i. Tours
The above table respect the rules for 1NF, which are the following:
i.  Every table should have a single value.
ii. Every record should be unique.
Thus, the table is subjected to other level of normalization. 

The second level is the 2NF which has the following two rules:
i.  The table should be in its 1NF.
ii. Functional dependencies are removed.
In this case the attribute “Tour Description” functionally depends on the “Tour Name”, hence it is removed in this case. The resulting table after normalization will look as follows:
Tour Number
Tour Name
Hours Required
Tour Cost Per Person
Wheel Chair per Person
Tour Availability
Start Time
1
Hobart Shopping
2.5
15
Yes
Weekdays
11:00
2
Port Arthur
8
270
No
Daily
09:00
3
MONA
4
70
Yes
Daily
13:00
4
Salamanca Market
3
15
Yes
Saturdays
11:00
 
The next stage of normalization is 3NF which has the following rules:
i.  The table should be in its 2NF.
ii. Transitive dependencies are removed.
The attribute “Hour required” transitively depends on the attribute “Tour Name.” Thus, the attribute “Hours required” is removed:
Tour Number
Tour Name
Tour Cost Per Person
Wheel Chair per Person
Tour Availability
Start Time
1
Hobart Shopping
15
Yes
Weekdays
11:00
2
Port Arthur
270
No
Daily
09:00
3
MONA
70
Yes
Daily
13:00
4
Salamanca Market
15
Yes
Saturdays
11:00
The next level of normalization is the Boyce-Codd Normal Form, BCNF which has the following rules:
i.  A table is in BCNF if every functional dependency X ? Y, X is the super key of the table.
ii. A table is in BCNF if every functional dependency X ? Y, X is the super key of the table.
Based on the above two rules of BCNF, the table cannot be subjected for further normalization.

iii.            Port Tour Participant Report
The above table respect the rules for 1NF, which are the following:
iii.            Every table should have a single value.
iv.             Every record should be unique.
Thus, the table is subjected to other level of normalization. The second level is the 2NF which has the following two rules:
iii.            The table should be in its 1NF.
iv.            Functional dependencies are removed.
In this case the attribute “Cruise Name” functionally depends on the “Cruise ID”, hence it is removed in this case. The resulting table after normalization will look as follows:
Passenger ID
Passenger Name
Principal Spoken Language
Cruise ID
Payment Received
10210
Gilberto Bwy
English
1024
Yes
10211
Fransyne Bwy
English
1024
Yes
10029
Friedrick Geist
German
1095
No
10789
Brier Kilgour
English
1095
No
10301
Shandra Lindblom
French
1024
Yes
10302
Pierre Lindblom
French
1024
Yes
10303
Michael Lindblom
French
1024
Yes
13456
Myriam Stirley
English
1095
Yes
 
The next stage of normalization is 3NF which has the following rules:
i.               The table should be in its 2NF.
ii.              Transitive dependencies are removed.
The attribute “Passenger Name” transitively depends on the attribute “Passenger ID.” Thus, the attribute “Hours required” is removed:
Passenger ID
Principal Spoken Language
Cruise ID
Payment Received
10210
English
1024
Yes
10211
English
1024
Yes
10029
German
1095
No
10789
English
1095
No
10301
French
1024
Yes
10302
French
1024
Yes
10303
French
1024
Yes
13456
English
1095
Yes
The above table cannot be further normalized into BCNF.
  

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