**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.