1. CMPE 180-38 Database Systems Exercise #3 Solutions
Department of Computer Engineering San Jose State University Spring 2017 Instructor: Ron Mak

2. Unofficial Field Trip Computer History Museum in Mt. View
Provide your own transportation to the museum.
Saturday, May 20, 11:30 – closing time
Special free admission (for my students only).
Experience a fully restored IBM 1401 mainframe computer from the early 1960s in operation.
Do a self-guided tour of the Revolution exhibit.
New Make/Software: Change the World exhibit.

3. 1.a. and 1.b. Describe an insertion anomaly with the table.
MovieCode
MovieName
ActorId
ActorName
AssistantId
AssistantName
ActorPay
M100
Le Film Noir
A11
Jean Wayne
AA01
Julia
$2,200,000
A22
G. Autré
$1,500,000
A33
C. Westwood
AA02
Rob
$2,000,000
A44
Barbara Stan
$2,500,000
M200
Horse Opera
AA03
Leslie
$1,900,000
$2,100,000
A55
R.W. Raygun
$1,200,000
Describe an insertion anomaly with the table.
You cannot add an actor or an assistant into the table without adding a movie.
Describe a deletion anomaly with the table.
If Jean Wayne decides not to star in Horse Opera and therefore the fifth row of the table is deleted, we lose the id and name of assistant Leslie.

4. 1.c. Describe a modification anomaly with the table.
MovieCode
MovieName
ActorId
ActorName
AssistantId
AssistantName
ActorPay
M100
Le Film Noir
A11
Jean Wayne
AA01
Julia
$2,200,000
A22
G. Autré
$1,500,000
A33
C. Westwood
AA02
Rob
$2,000,000
A44
Barbara Stan
$2,500,000
M200
Horse Opera
AA03
Leslie
$1,900,000
$2,100,000
A55
R.W. Raygun
$1,200,000
Describe a modification anomaly with the table.
If assistant Julia retires and is replaced by another person, three rows of the table need to be modified. Also, three rows need to be modified if assistant Rob retires.

5. 1.d.
MovieCode
MovieName
ActorId
ActorName
AssistantId
AssistantName
ActorPay
M100
Le Film Noir
A11
Jean Wayne
AA01
Julia
$2,200,000
A22
G. Autré
$1,500,000
A33
C. Westwood
AA02
Rob
$2,000,000
A44
Barbara Stan
$2,500,000
M200
Horse Opera
AA03
Leslie
$1,900,000
$2,100,000
A55
R.W. Raygun
$1,200,000
Draw a diagram showing full key, partial, and transitive functional dependencies of the table. Clearly label the type of functional dependency.

6. 1.e.
What is the result of normalizing the table to 3NF?

7. 2.a.
Year
Department
Leader ID
Amount
2015
CMPE
Sigurd Meldal
$12,000 CS
Sami Khuri
$11,000
2016
Math
Bem Cayco
$10,000
Xiao Su
You want to record the fact that in the year 2017, Mary Jane, who has ID and does not belong to a department, is the leader of the Spartan Committee. Briefly explain why you can or cannot add a 2017 row for her and enter nulls for the Department and Amount fields.
You cannot add a 2017 row where the Department field is null. The Department field is part of the composite primary key. Therefore, leaving that field null violates the entity integrity constraint.

8. 2.b. Normalize this table to third normal form (3NF).
Year
Department
Leader ID
Amount
2015
CMPE
Sigurd Meldal
$12,000 CS
Sami Khuri
$11,000
2016
Math
Bem Cayco
$10,000
Xiao Su
Normalize this table to third normal form (3NF).
ID  Leader is a transitive functional dependency. We can move those columns into a new table:
Year Department ID Amount
ID Leader

9. 2.c.
Year
Department
Leader ID
Amount
2015
CMPE
Sigurd Meldal
$12,000 CS
Sami Khuri
$11,000
2016
Math
Bem Cayco
$10,000
Xiao Su
Give a good reason why you may want to leave this table unnormalized.
The original table has faster query response.

10. 3.a.
Show the full key functional dependencies, any partial functional dependencies, and any transitive functional dependencies.

11. 3.b.
Normalize the table to third normal form (3NF).