What are common MySQL errors

    // Example of a common MySQL error: Access denied for user
    $servername = "localhost";
    $username = "wrong_user";
    $password = "wrong_password";

    // Create connection
    $conn = new mysqli($servername, $username, $password);

    // Check connection
    if ($conn->connect_error) {
        die("Connection failed: " . $conn->connect_error); // Access denied error
    }
    echo "Connected successfully";