Data analysis and analysis function skills for PHP and Oracle database

Data analysis and analysis function skills of PHP and Oracle database

Introduction
In the development process of modern computer applications, data analysis is a very important link. Especially for large database applications, in order to obtain valuable information from massive data, data analysis and analysis functions need to be used. This article will introduce how to use the PHP programming language and Oracle database to perform data analysis techniques, and give some relevant sample codes.

1. Connection between PHP and Oracle database
Before starting, you first need to ensure that you have correctly connected to the Oracle database. You can use PHP's PDO extension to connect to the database. The following is a simple sample code:

<?php
$servername = "localhost";
$username = "your_username";
$password = "your_password";
$dbname = "your_database";

try {
    $conn = new PDO("oci:dbname=".$dbname.";charset=utf8", $username, $password);
    $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
    echo "Connected successfully";
} catch(PDOException $e) {
    echo "Connection failed: " . $e->getMessage();
}
?>

2. Basic data query
Before performing data analysis, you first need to perform basic data query operations on the database. The following sample code demonstrates how to execute a simple query and output the data in the result set.

<?php
$stmt = $conn->prepare("SELECT * FROM your_table");
$stmt->execute();
$result = $stmt->fetchAll(PDO::FETCH_ASSOC);

foreach($result as $row) {
    echo $row['column1']." | ".$row['column2']." | ".$row['column3']."<br>";
}
?>

3. Data analysis functions
When performing data analysis, you can use some SQL built-in analysis functions to complete various calculation operations. The following lists some commonly used data analysis functions:

1. SUM: Sum
   Example code:

SELECT SUM(salary) as total_salary FROM your_table

2. AVG: Average
   Example Code:

SELECT AVG(salary) as average_salary FROM your_table

3. MAX: Maximum value
   Sample code:

SELECT MAX(salary) as max_salary FROM your_table

4. MIN: Minimum value
   Sample code:

SELECT MIN(salary) as min_salary FROM your_table

5. COUNT: Count
   Sample code:

SELECT COUNT(*) as total_records FROM your_table

4. Data analysis example
A complete example is given below, assuming there is an employee Table containing information about employee names, departments, and salaries. We want to calculate the average salary for each department and sort them in descending order of salary.

<?php
$stmt = $conn->prepare("
    SELECT department, AVG(salary) as average_salary 
    FROM employees 
    GROUP BY department 
    ORDER BY average_salary DESC");
$stmt->execute();
$result = $stmt->fetchAll(PDO::FETCH_ASSOC);

foreach($result as $row) {
    echo $row['department']." | ".$row['average_salary']."<br>";
}
?>

Conclusion
Through the introduction of this article, I believe that readers have a certain understanding of using PHP and Oracle database for data analysis and analysis functions. Of course, in actual projects, data analysis requirements may be more complex and involve more data processing and calculation operations. It is hoped that readers can master more data analysis skills through learning and practice, and be able to flexibly apply them in actual projects.

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