What resources or documentation can help in understanding SQL joins for PHP developers?

Understanding SQL joins can be challenging for PHP developers, especially when working with complex database queries. To grasp the concept of joins, developers can refer to online tutorials, official documentation from SQL databases like MySQL or PostgreSQL, and PHP frameworks that provide built-in support for handling joins. Additionally, practicing by writing and executing SQL queries with different types of joins can help developers improve their understanding and proficiency in using joins in PHP applications.

$query = "SELECT users.name, orders.product_name 
          FROM users 
          JOIN orders ON users.id = orders.user_id";
$result = mysqli_query($connection, $query);

if(mysqli_num_rows($result) > 0) {
    while($row = mysqli_fetch_assoc($result)) {
        echo "User: " . $row['name'] . " | Product: " . $row['product_name'] . "<br>";
    }
}