รบกวนช่วยดูด้วยค่ะ แก้ไขข้อมูล 2 ตารางไม่ได้ แจ้งว่าแก้ไขข้อมูลไม่สำเร็จ

<form action="Ad_edit_Rfdata_save.php?Rf_name=<?php echo $_GET["Rf_name"];?>" name="frmEdit" method="post">

<br/>

<?php

//$data[1]=str_replace("&",$data[1]);

$strSQL = "SELECT reference_data.Rf_name, company.Com_name
			FROM reference_data
			LEFT JOIN company ON reference_data.Com_ID = company.Com_ID
			WHERE reference_data.Rf_name ='$Rf_name' " ;

$objQuery = mysql_query($strSQL);
//echo $strSQL;
$objResult = mysql_fetch_array($objQuery);
 if(!$objResult)
{
	echo "Not found =".$_GET["Rf_name"];
}
else
{
?>
<table align="center" width="50%" border="1" cellspacing="0" cellpadding="2" style="border-collapse:collapse;">

  <tr>
    <td bgcolor="#f79e45" width="20%" scope="col"><div align="center">ชื่อฐานข้อมูล</div></td>
    <td><input type="text" name="Rf_name" id="Rf_name" size="50"  value="<?php echo $objResult["Rf_name"];?>"></td>
    </tr>
 <tr>
    <td bgcolor="#f79e45" width="20%" scope="col"><div align="center">ชื่อบริษัท</div></td>
    <td><input type="text" name="Com_name" id="Com_name" size="50"  value="<?php echo $objResult["Com_name"];?>"></td>
    </tr>
  </table>   
  	<tr align="center"><input type="submit" name="submit" value="บันทึก"></tr>

  <?php
}
  ?>
  </form>

<?php
	include("connect.php");		
	
	$Rf_ID       = $_POST['Rf_ID'];
	$Rf_name     = $_POST['Rf_name'];
	$Com_ID      = $_POST['Com_ID'];
	$Com_name    = $_POST['Com_name'];
	

$sql="UPDATE reference_data A,company B SET A.Rf_name = '$Rf_name', 
		B.Com_name = '$Com_name',  
		WHERE A.Com_ID = B.Com_ID and A.Rf_name ='$Rf_name'";

	
							
echo $sql;
				
	$row = mysql_query($sql);
	
	if($row)
	{
		$_GET[Rf_name]=$Rf_name;
		echo $msg ="<script>alert('แก้ไขข้อมูลเรียบร้อย');window.location='show_Rfdata.php';</script>";
	   echo "<meta http-equiv='refresh' content='10;URL=show_Rfdata.php'>";

	}
	else 
	{
	echo $msg ="<script>alert('แก้ข้อมูลไม่สำเร็จ');window.location='show_Rfdata.php';</script>";
		echo "<meta http-equiv='refresh' content='10;URL=show_Rfdata.php'>";
}
	echo $sql;
	
?>