What SQL query can be used in PHP to add two data columns and order the results in descending order?

To add two data columns and order the results in descending order in SQL, you can use the following query: ```sql SELECT column1 + column2 AS total_sum FROM your_table ORDER BY total_sum DESC; ``` In PHP, you can execute this query using the PDO extension. Here is a complete PHP code snippet that connects to a database, executes the SQL query, and fetches the results: 

<?php
$servername = "your_servername";
$username = "your_username";
$password = "your_password";
$dbname = "your_dbname";

try {
    $conn = new PDO("mysql:host=$servername;dbname=$dbname", $username, $password);
    $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

    $sql = "SELECT column1 + column2 AS total_sum FROM your_table ORDER BY total_sum DESC";
    $stmt = $conn->prepare($sql);
    $stmt->execute();

    $results = $stmt->fetchAll(PDO::FETCH_ASSOC);
    
    foreach ($results as $row) {
        echo $row['total_sum'] . "<br>";
    }

} catch(PDOException $e) {
    echo "Error: " . $e->getMessage();
}

$conn = null;
?>

Keywords

SQL query PHP data columns order descending

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