## Description

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

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.

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.

Grading rubric

Attributes Meets Does Not Meet

Normal form 20 points

Student correctly identifies normal

form of initial relation

0 points

Major error in identification of normal

form or not specified

Primary key 25 points

Student correctly identified primary

key of initial relation

0 points

Major error with identification of

primary key or not specified

Data anomalies 15 points

Student correctly describes data

anomalies

0 points

Major errors with description of data

anomalies or not specified

Functional dependency

diagram

15 points

Student correctly develops functional

dependency diagram of initial

relation

0 points

Major errors developing functional

dependency diagram or not specified

Normalized 3NF

relations

25 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