How can PHP be optimized to efficiently calculate and aggregate values from related rows in a database?

To efficiently calculate and aggregate values from related rows in a database using PHP, you can utilize SQL queries with aggregate functions like SUM, COUNT, AVG, etc. to perform calculations directly within the database query. This reduces the amount of data transferred between the database and the PHP script, improving performance and efficiency. 

<?php
// Connect to the database
$connection = new mysqli("localhost", "username", "password", "database");

// Query to calculate the total sum of a column 'value' from related rows
$query = "SELECT SUM(value) AS total_sum FROM table_name WHERE related_column = 'related_value'";

// Execute the query
$result = $connection->query($query);

// Fetch the result
$row = $result->fetch_assoc();

// Output the total sum
echo "Total Sum: " . $row['total_sum'];

// Close the connection
$connection->close();
?>

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