我必须显示一些任务的进度。从mysql中检索数据以显示任务的进度。我的密码在这里

<h4>Task 1</h4>
                    <div class="progress progress-striped">
                    <?php

  $mysqli = new mysqli("localhost","root", "", "db1");

 $query = $mysqli->prepare("SELECT COUNT(*) FROM `table1` Group by `ID`");
 $query->execute();
 $query->store_result();

 $rows = $query->num_rows;

 $percentage = $rows/120 * 100;

  ?>

<div class="progress-bar progress-bar-success" role="progressbar" aria-valuenow="40" aria-valuemin="0" aria-valuemax="100" style="<?php echo $percentage; ?>%">

 <?php echo $percentage; ?>%

                          </div>
                        </div>

但是我的进度条没有显示它的空。因为我的表包含4条记录