PHP和Oracle数据库的数据分析和分析函数技巧

<?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();
}
?>

<?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>";
}
?>

SELECT SUM(salary) as total_salary FROM your_table

SELECT AVG(salary) as average_salary FROM your_table

SELECT MAX(salary) as max_salary FROM your_table

SELECT MIN(salary) as min_salary FROM your_table

SELECT COUNT(*) as total_records FROM your_table

<?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>";
}
?>