# 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

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.

•         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/

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.