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. 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:
• 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
• 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
errors in development of proper set of 3NF relations or not specified.
