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SIM-A2-CSCI235-2021S2

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Assignment 2 (15% of total marks)
Due date: Thursday, 20 May 2021
Scope:
The tasks of this assignment cover topics on PLSQL as well as Transaction
processing and concurrency.
Assessment criteria:
Marks will be awarded for:
 Correct,
 Comprehensive, and
 Appropriate
application of the materials covered in this subject.
Please read carefully information listed below.
This assignment contributes to 15% of the total assessment mark for the subject
CSCI235.
A submission procedure is explained at the end of specification.
This assignment consists of 4 tasks and specification of each task starts from a new
page.
A policy regarding late submissions is included in the subject outline.
For all the implemented tasks, your report or output must include a listing of all PL/SQL
statements processed. To achieve that put the following SQL*Plus commands in all
your scripts:
SPOOL file-name
SET ECHO ON
SET FEEDBACK ON
SET LINESIZE 100
SET PAGESIZE 200
SET SERVEROUTPUT ON
at the beginning of SQL script and
SPOOL OFF
at the end of SQL script.

SIM-A2-CSCI235-2021S2
Copyright SCIT, University of Wollongong, 2021
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Assignment Specification:
Preliminary actions
The Assignment 2 folder contains the SQL scripts dbCreateBook-2021S2.sql. Execute
the script dbCreateBook-2021S2.sql to create and to load a sample database. The
database contains information about the products as well as transactions done by
customers for the sample database. It is strongly recommended that you discover the
conceptual schema (UML diagram) of the database. However, there will be no mark
awarded for producing the conceptual schema.
Task 1 (2.0 marks)
PL/SQL block
Implement PL/SQL block that modifies the prices of books and videos according
to the following rules:

• if a product belongs to a category‘book’and it has not been purchased
  in the last 30 days then decrease its price by 3%,
• if a product belongs to a category‘video’and it has been purchased less
  than 5 times in the last 20 days then decrease its price by 5%.
  To test your PL/SQL block implement SQL script that displays the numbers and
  prices of products included in Product table. Execute the PL/SQL block and
  displays the numbers and prices for the second time.
  Deliverables
  Hand in an SQL script and the report from execution of the script. The report
  must have no errors related to the implementation of your task and it must list
  all PL/SQL and SQL statements processed.
  Remember to set ECHO option of SQL*Plus to ON!

SIM-A2-CSCI235-2021S2
Copyright SCIT, University of Wollongong, 2021
Page 3 of 5
Task 2 (2.0 marks)
PL/SQL Procedure
Create a table UserChoice(p#, price) to store information about products
(number and price) selected by a user. Leave the table UserChoice empty when
first created.
Implement a stored PL/SQL procedure FindProducts(category, keyword) that
finds all products categorized by the input parameter category and described
by the input parameter keyword. For example, FindProducts(‘book’,‘database’)
will find all books that are described or related to‘database’. The procedure is
to store the numbers and prices of all selected products in UserChoice table.
Consider the following categories of products – book, video and cdrom when
you test your procedure.
To test your procedure, (i) implement SQL script that displays the contents of
empty UserChoice table, (ii) execute CREATE OR REPLACE PROCEDURE
statement to store FindProducts in a data dictionary, and (iii) execute a stored
procedure FindProducts again to display the contents of nonempty UserChoice
table.
Deliverables
Hand in the SQL script and the report from execution of scripts. The report
must have no errors related to the implementation of your task and it must list
all PL/SQL and SQL statements processed.
Remember to set ECHO option of SQL*Plus to ON!

SIM-A2-CSCI235-2021S2
Copyright SCIT, University of Wollongong, 2021
Page 4 of 5
Task 3 (2.0 marks)
Stored trigger
Implement a database trigger such that for each row that is inserted into Pbasket
table, the trigger activates a verification process to verify a value of credit card number
attribute. Whenever a credit card number that is included in a new row has been
already used by another customer, your trigger should abort the attempted insert
operation.
To test your trigger, execute SQL script that contains CREATE OR REPLACE TRIGGER
statement, INSERT statement to insert a row into Pbasket table with a new credit card
number, and INSERT statement to insert another row into Pbasket table with a credit
card number already used by another customer.
Deliverables
Hand in the SQL script and the report from execution of scripts.
Remember to set ECHO option of SQL*Plus to ON!
Submissions
This assignment is due by 9:00 pm (21:00 hours) 20 May 2021, Singapore time.
Submit the files solution1.pdf, solution2.pdf, and solutions3.pdf through Moodle
in the following way:
1) Zip all the files (Solution1.pdf, solution2.pdf, and solution3.pdf into one
zipped folder.)
2) Access Moodle at http://moodle.uowplatform.edu…
3) To login use a Login link located in the right upper corner the Web page or in
the middle of the bottom of the Web page
4) When successfully logged in, select a site CSCI235 (SP221) Database
Systems
5) Scroll down to a section Submissions of Assignments
6) Click at Submit your Assignment 2 here link.
7) Click at a button Add Submission
8) Move the zipped file created in Step 1 above into an area provided in Moodle.
You can drag and drop files here to add them. You can also use a link Add…
9) Click at a button Save changes,
10) Click at check box to confirm authorship of a submission,
11) When you are satisfied, remember to click at a button Submit assignment.
A policy regarding late submissions is included in the subject outline.
Only one submission per student is accepted.

SIM-A2-CSCI235-2021S2
Copyright SCIT, University of Wollongong, 2021
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Assignment 2 is an individual assignment and it is expected that all its tasks will be
solved individually without any cooperation with the other students. Plagiarism is
treated seriously. Students involved will likely receive zero. If you have any doubts,
questions, etc. please consult your lecturer or tutor during lab classes or over e-mail.
End of specification