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Lab 5 – Stored Procedures/Conditional Statements

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DBS311 – Advanced Data Systems
1 | P a g e
Lab 5 – Stored Procedures/Conditional Statements
Submission
Your submission will consist of two files:
(a) A single text-based SQL file with appropriate header and commenting – and
(b) An output file demonstrating that your stored procedures work
Please ensure your SQL file runs when the entire file is executed.
Your file names should be L05-lastname-firstname
For example: L05-King-Les.sql and L05-King-Les.output or L05-King-Les.pdf, etc.
Your submission needs to be commented. At a minimum, your comments before each SQL
statement should include the complete question below you are answering.
Style Guide
For all the stored procedures make sure you handle all exceptions such as
• TOO_MANY_ROWS
• NO_DATA_FOUND
• OTHERS
• . . .
Besides checking all required exceptions, have the OTHER exception checked just in case any
error occurs that has not been anticipated at the time you write the code.
Stored procedures are programs and all programs should be properly commented to explain
your logic.
Tasks
1. Write a store procedure that get an integer number and prints
The number is even.
If a number is divisible by 2.
Otherwise, it prints
The number is odd.
2. Create a stored procedure named find_employee. This procedure gets an employee number
and prints the following employee information:
First name
Last name
Email
Phone
Hire date
Job title
The procedure gets a value as the employee ID of type NUMBER.
See the following example for employee ID 107:
First name: Summer
Last name: Payn
Email: summer.payne@example.com
Phone: 515.123.8181
Hire date: 07-JUN-16
Job title: Public Accountant
The procedure display a proper error message if any error accours.
3. Every year, the company increases the price of all products in one category. For example, the
company wants to increase the price (list_price) of products in category 1 by $5. Write a
procedure named update_price_by_cat to update the price of all products in a given category
and the given amount to be added to the current price if the price is greater than 0. The
procedure shows the number of updated rows if the update is successful.
The procedure gets two parameters:
• category_id IN NUMBER
• amount NUMBER(9,2)
To define the type of variables that store values of a table’ column, you can also write:
vriable_name table_name.column_name%type;
The above statement defines a variable of the same type as the type of the table’ column.
category_id products.category_id%type;
Or you need to see the table definition to find the type of the category_id column. Make sure
the type of your variable is compatible with the value that is stored in your variable.
To show the number of affected rows the update query, declare a variable named
rows_updated of type NUMBER and use the SQL variable sql%rowcount to set your
variable. Then, print its value in your stored procedure.
Rows_updated := sql%rowcount;
DBS311 – Advanced Data Systems Summer 2020
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SQL%ROWCOUNT stores the number of rows affected by an INSERT, UPDATE, or
DELETE.
4. Every year, the company increase the price of products whose price is less than the average
price of all products by 1%. (list_price * 1.01). Write a stored procedure named
update_price_under_avg. This procedure do not have any parameters. You need to find the
average price of all products and store it into a variable of the same type. If the average price
is less than or equal to $1000, update products’ price by 2% if the price of the product is less
than the calculated average. If the average price is greater than $1000, update products’ price
by 1% if the price of the product is less than the calculated average. The query displays an
error message if any error occurs. Otherwise, it displays the number of updated rows.
5. The company needs a report that shows three category of products based their prices. The
company needs to know if the product price is cheap, fair, or expensive. Let’s assume that
▪ If the list price is less than
o (avg_price – min_price) / 2
The product’s price is cheap.
▪ If the list price is greater than
o (max_price – avg_price) / 2
The product’ price is expensive.
▪ If the list price is between
o (avg_price – min_price) / 2
o and
o (max_price – avg_price) / 2
o the end values included
The product’s price is fair.
Write a procedure named product_price_report to show the number of products in each price
category:
The following is a sample output of the procedure if no error occurs:
Cheap: 10
Fair: 50
Expensive: 18
The values in the above examples are just random values and may not match the real
numbers in your result.
The procedure has no parameter. First, you need to find the average, minimum, and
maximum prices (list_price) in your database and store them into varibles avg_price,
min_price, and max_price.
You need more three varaibles to store the number of products in each price category:
DBS311 – Advanced Data Systems Summer 2020
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cheap_count
fair_count
exp_count
Make sure you choose a proper type for each variable. You may need to define more
variables based on your solution.
Example Submission
— ***********************
— Name: Your Name
— ID: #########
— Date: The current date
— Purpose: Lab 5 DBS311
— ***********************
— Question 1 – Copy of question from above
— Q1 SOLUTION –
CREATE OR REPLACE procedure_name(arg1 data_type, …) AS
BEGIN
….
EXCEPTION
WHEN OTHERS
THEN
DBMS_OUTPUT.PUT_LINE (Error!’);
END procedure_name;
— Question 2 – Copy of question from above
— Q2 Solution –

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