Project 4 Solution

$30.00

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Description

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?

  1. 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.

  1. Describe the specific data anomalies that exist if we DELETE the tuple containing Jacqueline.

  1. Draw a functional dependency diagram for the initial relation. This diagram should agree with the primary key you selected in above.

  1. Based on your diagram, what normal form is the initial relation in? Why?

  1. 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

0 points

Student correctly identifies normal

Major error in identification of normal

form of initial relation

form or not specified

Primary key

25 points

0 points

Student correctly identified primary

Major error with identification of

key of initial relation

primary key or not specified

Data anomalies

15 points

0 points

Student correctly describes data

Major errors with description of data

anomalies

anomalies or not specified

Functional dependency

15 points

0 points

diagram

Student correctly develops functional

Major errors developing functional

dependency diagram of initial

dependency diagram or not specified

relation

Normalized 3NF

25 points

0 points

relations

Student correctly develops the

Major errors in development of proper

proper set of 3NF relations via

set of 3NF relations or not specified

normalization


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