Exam No 1 1 2 3 Question solved

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.

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.)

 
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.

Exam No 1 1 2 3 Question solved

Computer (StationID, Vendor, Model)

Software (SoftwareID, Type, Version)

SoftwareInstalled (SoftwareID, StationID

• Exam No. 1 Solution to 1,2,3.docx 129 KB

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Jjwhiskeytango

A+ - Thank you!

Helper

Thanks for the positive feedback!