CS403 Assignment No 4 Deadline 29 June 2010

[Guru]

CS403 Database Management Systems Assignment No 4
Spring 2010
Total Marks: 20
Due Date: 29/06/2010

[Q1. In which normal form the following STUDENT relation is if only A,B can act as the key. Marks 10

STUDENT(A, B, C, D, E, F, G, H) Where A, B, C and so on are the attributes of the relation STUDENT.
A, B -> C, D, E
C -> F
D -> G
E -> H
Note: Also mention why the relation is in that normal form.

Q2. Examine the table shown below which is already in Second Normal Form (2NF). Marks 10



You are required to normalize this relation into Third Normal Form (3NF).


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[ayb]

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[Xpert]

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[ayb]

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[Xpert]

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[viki]

[Q1. In which normal form the following STUDENT relation is if only A,B can act as the key. Marks 10

Answer:
No normal form exist here because here is functional dependency and starting form first normal form we have to remove the functional dependency. That’s why relation is in no normal form.




Q2. Examine the table shown below which is already in Second Normal Form (2NF). Marks 10




Answer:
3rd normal form:

Address ---------------------------------------------- Tel_No
New Garden Town, Lahore---------------------------042-4466375,042-4586975,042-4554668
Blue Area, Islamabad---------------------------------- 051-5546584,051-4687458



Address is taken as forigen key in 3rd normal form.