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Exam No. 1, (Take-home part, 70%)
Copy each question before answering it ( 6 questions in total).
1. (12 points) You have been hired by an environmental consulting company (CC) that specializes in creating environmental impact statement (EIS) for large projects. It needs a database to track the progress of each EIS. The company is particularly concerned about tracking public comments, questions from state and federal officials and the response to all these comments. All comments are scanned and stored as digital files.
Create a data model (E/R model) for the database based on following report.
EIC project #:
Date initiated:
Date ECC involved
Date ECC finished
Client
Principle contact: Billing:
Phone: Phone:
Contact address Billing address
City, state, zip City, State, Zip
Site location: latitude longitude
Site address : city state zip
Site description
Proposed development description
Proposed activities (standard list)
Drain wetlands
Fill
Build road
Store waste
Comments and response
Date received Category Source File Response date Person title
…m m m < /span>
2 (15 points) You are asked to develop a database for microcomputer lab management. You want to keep track of the following information (Type your answer):
The information about computer such as station ID, vendor, model, etc.
The information about the software installed. Each computer is equipped with various types of software (e.g., word processor, spreadsheet, database, Web page tools, etc.) Note you only care about the types, version and vendors of the software, not the licensing information of each piece of software. You just want to know which type of the software is used most frequently.
The information about projects that are running on some computer systems (hardware). Including the project ID, description, project leader and starting date, etc.
The information about users who are the employees currently working some projects. Including emplyee’s ID and name, as well as job title.
The information about appointments made by users to use the lab. For an appointment, employee must indicate the computer (station ID), types of software, and the time period of using computers.
Note: In each appointment, an employee can only indicate one computer with multiple software to use.
a. Design an E/R diagram to describe above situation.
b. Convert the data model in (a) into database design model, showing the keys, attributes, foreign keys. Use table notation (Tablename (....)).
3. (15 points) Given a table (and assuming the given data shows all possible FDs.)
playerID
name
year
JerseyNo.
scoreInYr
gamePlayed
teamID
teamName
teamLoc
TeamManager
1
john
2001
32
150
5
1
xyz
LA
lee
1
john
2002
32
140
6
1
xyz
LA
smith
2
Roman
2001
10
120
1
2
abc
NY
kim
3
shaw
1999
10
120
1
3
ijk
NY
kelly
3
shaw
2001
10
110
2
1
xyz
LA
lee
3
shaw
2002
11
130
2
3
ijk
NY
kelly
4
peter
2001
15
140
2
2
abc
NY
kim
……
Type your answer
a. List all FDs.
b. If you want to create above table in a database, what is the primary KEY for this table? (note this table is in a very bad design).
c. What normal form this table is in? Why ?
d. Describe the insertion,deletion and update anomalies, be as specific as possibel. For example, you need to say, when row X is deleted because of player W quit the job, then we need to deleted what row, and what problem will occur. etc.
e. How many themes (i.e., pieces of information) that are implied by above table?
f. Normalize above table into 3NF. In the normalization result you must show the table name and the key,and FK if there is any.
4. (10 points) A law firm designed the following table to keep track the information about cases and the lawyers who handle the cases:
Case (caseNumber, caseDescription, lawyerInCharge, caseAssistant, beginningdate, ending,Date, lawyerRate, accumulatedHours, clientsName., clientPhone, clientAdress, clientType, laywerPhone, caseResultDescription, clientCurrentPayment, paymentMethod, salary, bonus)
Among above attributes,
caseNumber, is the ID of the case
lawyerInCharge is the name of the lawyer (a single person) who in charge of the case.
There may be also several other people in the firm serve in the same case as the caseAssistant working for one lawyerInCharge
beginningDate, ending,Date indicate the period of the case
lawyerRate, is the hourly payrate of the client have to pay for the firm’s service in this case. This rate depends on the case.
accumulatedHours is the total hours of the client service,
clientType can be either individual or cooporate,
laywerPhone is the phone number of the lawyerInCharge,
caseResultDescription gives the description about the case result.
clientCurrentPayment shows the total payment from client
paymentMethod can be credit card, cash or check
salary and bonus belongs to the lawyerInCharge
Type your answer
a. List all functional dependencies based on the given information
b. What is the key if you have all these attributes in just one table?
c. How do you normalize the table into BCNF. Show your result. (don’t forget the table name and the key for each table. Also pay attention to the foreign keys).
5. (12 points) Use the following form given by Chen's Art Gallery
Gallery Customer History Form
Customer Name
Jackson, Elizabeth Phone (206) 284-6783
123 –4th Avenue
NoOneLivesIn, NJ00001
Purchases Made
Artist Title Purchase Date Sales Price
03 - Carol Channing Laugh with Teeth 09/17/2000 7000.00
15 - Dennis Frings South toward Emerald Sea 05/11/2000 1800.00
03 - Carol Channing At the Movies 02/14/2002 5550.00
15 - Dennis Frings South toward Emerald Sea 07/15/2003 2200.00
The Chen's Art Gallery wishes to maintain data on their customers, artists and paintings. They may have several paintings by each artist in the gallery at one time. Paintings may be bought and sold several times. In other words, the gallery may sell a painting, then buy it back at a later date and sell it to another customer.
a. Create an E/R model for this information requirement.
b.Transform the E/R model into a set of tables that are at least in 3NF.
6. (6 points) What is denormalization? Why is it necessary sometimes. Give an example (not from the book) with your explanation.
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