How can PHP be used to calculate values in a database based on specific criteria?

To calculate values in a database based on specific criteria using PHP, you can write a SQL query that selects the data meeting the criteria and perform the calculation within the query itself. You can then execute this query using PHP's database connection functions to retrieve the calculated values. 

<?php
// Connect to the database
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "database_name";

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

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

// SQL query to calculate values based on specific criteria
$sql = "SELECT SUM(column_name) AS total_value FROM table_name WHERE criteria_column = 'criteria_value'";

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

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

$conn->close();
?>

Keywords

PHP database calculation criteria values

Related Questions