How Can I Efficiently Retrieve the Sum of a Column from a MySQL Table Using PHP?

Retrieving Column Sum in PHP from MySQL

Query Approach

If your objective is to obtain the sum of a specific column in a MySQL table, the most efficient solution can be implemented directly in the MySQL query itself. This approach significantly reduces server-side processing and provides the result in a single query.

SELECT SUM(column_name) FROM table_name;

PDO Methodology

For PHP applications using the PDO library (which replaces the deprecated mysql_query), the following code snippet demonstrates how to retrieve the column sum:

$stmt = $handler->prepare('SELECT SUM(value) AS value_sum FROM codes');
$stmt->execute();

$row = $stmt->fetch(PDO::FETCH_ASSOC);
$sum = $row['value_sum'];

mysqli Implementation

If you're using the mysqli extension, the column sum can be retrieved as follows:

$result = mysqli_query($conn, 'SELECT SUM(value) AS value_sum FROM codes'); 
$row = mysqli_fetch_assoc($result); 
$sum = $row['value_sum'];

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