How to Efficiently Calculate the Sum of a MySQL Column Using PHP?

Calculating MySQL Column Sum: PHP Methods Explained

Q: How to compute the sum of a MySQL table column using PHP?

One common task in data manipulation is obtaining the sum of a column's values. While implementing a loop like the one provided is a logical approach, we can utilize more efficient techniques in PHP.

A: Leveraging MySQL Queries for Sum Calculations

The most straightforward method is executed directly within the MySQL query itself:

// query the database and obtain the sum value
$query = 'SELECT SUM(column_name) FROM table_name';
$result = mysqli_query($conn, $query);

// extract the sum value
$row = mysqli_fetch_assoc($result);
$sum = $row['SUM(column_name)'];

// display the sum value
echo $sum;

B: Using PDO for Sum Calculations (Recommended)

PDO is a modern, object-oriented PHP library recommended for database interactions. The following code snippet effectively calculates the sum using PDO:

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

// execute the query
$stmt->execute();

// fetch the result and extract the sum
$row = $stmt->fetch(PDO::FETCH_ASSOC);
$sum = $row['value_sum'];

// display the sum value
echo $sum;

The above is the detailed content of How to Efficiently Calculate the Sum of a MySQL Column Using PHP?. For more information, please follow other related articles on the PHP Chinese website!