CMIS320 Project 4

05 Jun CMIS320 Project 4

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Question

CMIS 320 Project 4

Examine the following relation and its attributes and answer the following questions. Assume these are the values for “all time”. Assume girls with the same name are the same person.

GIRL	GROUP AGE		GAME CATEGORY	PRICE
Charlotte	5 year olds	5	Mirror	Makeup	4.88
Susan	6 year olds	6	Lipstick Makeup	5.95
Jane	5 year olds	5	Chess	Games	7.55
Susan	6 year olds	6	Checkers	Games	5.95
Susan	6 year olds	6	Mirror	Makeup	4.88
Carrie	6 year olds	6	Lipstick Makeup	5.95
Jacqueline	5 year olds	5	Visual Basic	Prog. Languages 199.99

1) Is this relation in at least 1NF? Why or why not?

2) What is the primary key of the initial relation (assume the values shown are the only possible tuples for all time)? Remember that a primary key must be unique and not null.

3) Describe the specific data anomalies that exist if we DELETE the tuple containing Jacqueline.

4) Draw a functional dependency diagram for the initial relation. This diagram should agree with the primary key you selected in above.

5) Based on your diagram, what normal form is the initial relation in? Why?

6) If necessary, decompose the initial relation into a set of non-loss 3NF relations by showing the relations, attributes, and tuples. Show complete relations with attribute headings and all data values in the tuples of your relations. Determine the number of 3NF relations you end up with after normalization, write this number, and then circle the number.

Grading rubric

Attributes	Meets	Does Not Meet
Normal form	20 points	0 points
	Student correctly identifies normal	Major error in identification of normal
	form of initial relation	form or not specified
Primary key	25 points	0 points
	Student correctly identified primary	Major error with identification of
	key of initial relation	primary key or not specified
Data anomalies	15 points	0 points
	Student correctly describes data	Major errors with description of data
	anomalies	anomalies or not specified
Functional dependency	15 points	0 points
diagram	Student correctly develops functional	Major errors developing functional
	dependency diagram of initial	dependency diagram or not specified
	relation
Normalized 3NF	25 points	0 points
relations	Student correctly develops the	Major errors in development of proper
	proper set of 3NF relations via	set of 3NF relations or not specified
	normalization

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