How can you properly store and retrieve the sum of a column in PHP?

To properly store and retrieve the sum of a column in PHP, you can use SQL queries to calculate the sum directly in the database and then retrieve the result in your PHP code. This ensures accuracy and efficiency in calculating the sum of a column. 

// Connect to the database
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "database";

$conn = new mysqli($servername, $username, $password, $dbname);

// Check connection
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}

// Query to calculate the sum of a column
$sql = "SELECT SUM(column_name) AS total_sum FROM table_name";

$result = $conn->query($sql);

if ($result->num_rows > 0) {
    // Output data of each row
    while($row = $result->fetch_assoc()) {
        echo "Total Sum: " . $row["total_sum"];
    }
} else {
    echo "0 results";
}

$conn->close();

Keywords

PHP MySQL SUM function SQL query data retrieval

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