如何在php

Question

我有3个字段，其中一个是我根据id选择的类型文件：

 $qryz="SELECT * FROM claims_follow_up.Reconciliation_Details where   id_rd ='$id_rd' ";
    $res = mysqli_query($dbc, $qryz);
  $dd=mysqli_fetch_array($res);

<label> Client Name</label> 
 <input type="text" name= "Client_Name"  value="<?=$dd['Client_Name']?></br>
 <label>Activity</label> 
 <input type="text" name= "Activity"  value="<?=$dd['Activity']?> " ></br>
<label>PDF_Report1</label> 
 <a href="uploads/<?php echo $dd['PDF_Report1'] ?>"  target="_blank"><?php echo $dd['PDF_Report1'] ?></a> 
  <?php echo '<a href="del_file.php?id_rd='.$dd['id_rd'].' " class="btn btn-primary btn-xs btn-danger" onclick="return confirm(\'Do you really want to delete this file ?\')"><i class="glyphicon glyphicon-trash"></i>Delete file #1</a>';?>

在我的表格中，文件列名称为 PDF_Report1

如何只删除 PDF_Report1 的内容？ 在页面 del_file.php 中，类似于：

  $id_rd  = $_GET["id_rd"] ;  
 $sql="delete PDF_Report1 from claims_follow_up.Reconciliation_Details where id_rd = '$id_rd' "; 

由于