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Lesson 3 Creating a procedure
Objective Create procedure to calculate sales transaction.

Creating an Oracle Procedure

Create a procedure to calculate a percentage and an average for a given sales transaction.
A procedure is created by using the CREATE PROCEDURE command and blocks of PL/SQL statements. Use the SlideShow below to see how a procedure is built. The Slide Show walks you through creating a procedure that accepts a primary key field as an incoming parameter and sends two calculated values back to two outgoing parameters.

1) Running Programs 1 2) Running Programs 2 3) Running Programs 3 4) Running Programs 4 5) Running Programs 5 6) Running Programs 6

Program 1 Program 2 Program 3 Program 4 Program 5 Program 6
Creating Oracle Procedure
The next lesson examines the capabilities and restrictions of calling other procedures.
Click the link below to create a procedure for the course project.
Create Replace Procedure

Built-in SQL functions

Question: How do you write your own built-in SQL functions?
Answer: A function is a PL/SQL named block that returns a value. It is commonly used to convert or assign values.
Note the following: 1) A procedure is executed, 2) a function is called, as in the example below:
   n_area := calc_area(11,22);

In the code fragment above, the area is calculated using a procedure named get_area and a function named calc_area.
The procedure was passed three values and it copied the calculated area into the n_area variable when the procedure exited. The next line uses a function that is
  1. passed two values,
  2. calculates the area, and
  3. returns that value,
which is assigned to the n_area variable.
Notice that the function is used directly in the assignment operation. A function is defined in the format below.

create or replace function <Name>
   (<variable list>) return <datatype>
 as (or is) 

  local variable declaration
   code section