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Calculating the Sum and Average of Three Numbers in PL/SQL


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In the realm of database programming, PL/SQL (Procedural Language/Structured Query Language) is a powerful tool for managing and manipulating data. Whether you're a beginner or an experienced programmer, understanding how to perform calculations such as the sum and average of numbers is fundamental.

In this guide, we’ll walk you through the process of calculating the sum and average of three numbers using PL/SQL. With clear explanations and example code snippets, you'll be equipped to implement this functionality efficiently in your projects.


What You’ll Learn

  • Understanding the basics of variable declaration in PL/SQL.
  • Step-by-step process to calculate the sum and average of three numbers.
  • Best practices for displaying results in the PL/SQL console.

Tabular Representation of Results

Below is an example of what the output might look like:

Num1 Num2 Num3 Sum Average
10 15 20 45 15
5 12 8 25 8.33
18 25 30 73 24.33

Step-by-Step Query to Calculate Sum and Average

Here’s the PL/SQL query to calculate the sum and average of three numbers:

sql
 
DECLARE
num1 NUMBER := 10; -- Replace with your desired value
num2 NUMBER := 20; -- Replace with your desired value
num3 NUMBER := 30; -- Replace with your desired value
sum_result NUMBER;
average_result NUMBER;
BEGIN
sum_result := num1 + num2 + num3;
average_result := sum_result / 3;

DBMS_OUTPUT.PUT_LINE('Sum: ' || sum_result);
DBMS_OUTPUT.PUT_LINE('Average: ' || average_result);
END;
/


Code Explanation

  1. Variable Declaration

    • The DECLARE section initializes variables. Here, num1, num2, and num3 store the three input numbers, while sum_result and average_result store the calculated results.
  2. Calculation Logic

    • Inside the BEGIN block, the sum is calculated by adding num1, num2, and num3.
    • The average is derived by dividing the sum by 3.
  3. Displaying Results

    • The DBMS_OUTPUT.PUT_LINE function is used to display the results directly in the PL/SQL console.

Practical Example

Input Values

Let’s say you have the following input values:

  • num1 = 10
  • num2 = 20
  • num3 = 30

Expected Output

makefile
 
Sum: 60
Average: 20

You can modify the input values to calculate the sum and average for any set of numbers.


Best Practices for PL/SQL Calculations

  1. Use Meaningful Variable Names

    • Names like num1, sum_result, and average_result make the code more readable.
  2. Test with Edge Cases

    • Ensure your logic handles edge cases, such as all input numbers being zero.
  3. Optimize Console Output

    • Format the output for better readability, especially when displaying decimal results.

Conclusion

In this article, we explored how to calculate the sum and average of three numbers in PL/SQL. With the provided query and step-by-step explanation, you can confidently implement this functionality in your PL/SQL environment.

By mastering these fundamental concepts, you'll be well-prepared to handle more complex calculations in your PL/SQL projects.


Related Articles

Feel free to explore these resources for more insights and to connect with the PL/SQL programming community. 🚀

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