menghubungkan data dengan left join

<?php
                                            $ambildata = mysqli_query($conn, "SELECT * FROM kom_user LEFT JOIN kom_nilai ON kom_user.id_us = kom_nilai.id_us");
                                            while($data=mysqli_fetch_array($ambildata)){
                                                $i=1;
                                                $npm                  = $data['npm'];
                                                $username             = $data['username'];
                                                $dosen_pembimbing     = $data['dosen_pembimbing'];