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
For each question below, please be sure to review the course content for additional reference material.
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. This can be drawn in any drawing
tool.
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.
Additional References:
• What is Normalization? https://www.guru99.com/database-normalization.html
• What is a Primary Key? https://www.techopedia.com/definition/5547/primary-key
• What are data anomalies? https://databasemanagement.fandom.com/wiki/Data_Anomalies
• What is a functional dependency diagram?
https://www.dlsweb.rmit.edu.au/Toolbox/ecommerce/dad_respak/dad_tutorial/html/dad_db3f_tu
t.htm#:~:text=A%20set%20of%20Functional%20Dependencies,the%20direction%20of%20the
%20dependency.
• The Third Normal Form. https://www.geeksforgeeks.org/third-normal-form-3nf/
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