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. Be
sure to identify dependencies like full, partial, transient, etc. between the attributes.
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:
• Whatis Normalization? https://www.guru99.com/database-normalization.html
• Whatis a Primary Key? https://www.techopedia.com/definition/5547/primary-key
• What are data anomalies? https://databasemanagement.fandom.com/wiki/Data_Anomalies
• The Third Normal Form. https://www.geeksforgeeks.org/third-normal-form-3nf/
Assignment-4’s grading rubric:
Attributes Meets Does Not Meet
Normal form
45 points
Student correctly identifies normal form
of initial relation.
0 points
Major error in identification of normal
form or not specified.
Primary key
60 points
Student correctly identified primary key
of initial relation.
0 points
Major error with identification of primary
key or not specified.
Data anomalies
30 points
Student correctly describes data
anomalies.
0 points
Major errors with description of data
anomalies or not specified.
Functional dependency
diagram
30 points
Student correctly develops functional.
dependency diagram of initial relation.
0 points
Major errors developing functional
dependency diagram or not specified.
Normalized 3NF relations
60 points
Student correctly develops the proper
set of 3NF relations via normalization.
0 points
Major errorsin development of proper
set of 3NF relations or not specified.