ต้องการหาค่าผลรวมของแต่ละ Rows ที่อยู่ใน Db ครับ PHP + MySQL

<?php
      $amount = 0;// <---------------------------------------------------------
      while($objResult = mysql_fetch_assoc($objQuery))
      {
      $INV_AMOUNT1 = $objResult['INV# AMOUNT'];
      $INV_AMOUNT2 = $objResult['INV# AMOUNT'];

      $total = $INV_AMOUNT1 + $INV_AMOUNT2;
      $amount = $amount+ $total; // <---------------------------------------------------------
      ?>
      <tr>
        <td><div align="center"><?php echo $objResult["ORDER"];?></div></td>
        <td><div align="center"><?php echo $objResult["CUSTOMER"];?></div></td>
        <td><div align="center"><?php echo $objResult["INVOICE"];?></div></td>
        <td><div align="center"><?php echo $objResult["SALESMAN"];?></div></td>
        <td><div align="center"><?php echo $objResult["INV# AMOUNT"];?></div></td>
        <td><div align="center"><?php echo $objResult["ORDER DATE"];?></div></td>
      </tr>
      <?php
     }
     echo "ยอดรวมสุทธิ = ";
     echo $total;
     echo $amount; // <---------------------------------------------------------
     echo "<br><br>";
?>

      function drawVisualization() {
        // Some raw data (not necessarily accurate)
        var data = google.visualization.arrayToDataTable([
         ['Day', 'Amount'],
         ['01',  "<?php echo $ResultDay1;?>"],
         ['02',  135],
         ['03',  157],
         ['04',  139],
         ['05',  136],
         ['06',  136],
         ['07',  136],
         ['08',  136],
         ['09',  136],
         ['10',  136],
         ['11',  136],
         ['12',  136],
         ['13',  136],
         ['14',  136],
         ['15',  136],
         ['16',  180],
         ['17',  135],
         ['18',  157],
         ['19',  139],
         ['20',  136],
         ['21',  136],
         ['22',  136],
         ['23',  136],
         ['24',  136],
         ['25',  136],
         ['26',  136],
         ['27',  136],
         ['28',  136],
         ['29',  136],
         ['30',  136],
         ['31',  136]
      ]);