สอบถามเรื่อง SQL รวมผลคะแนนหน่อยครับผม พอดีงงมากเลยครับ

<?php
$connection=mysql_connect("localhost","root","password") or die("เชื่อมต่อฐานข้อมูลไม่ได้");
mysql_select_db("consensus_mysql") or die("ไม่สามารถเลือกฐานข้อมูลได้");
mysql_query("set character set utf8"); // กำหนดค่า character set ที่จะใช้แสดงผล
$sql = "SELECT id, firstname FROM member WHERE status_id =3 ORDER BY id"; 
$rsItem = mysql_query($sql) or die("Select error1 : ".mysql_error()); 
$item_id = array();
$item = array();
$i = 0;
while($value = mysql_fetch_assoc($rsItem)){
$item_id[$i] = $value['id'];	
$item[$i] = $value['firstname']; 
$i ++;
}
mysql_free_result($rsItem); 

$sql = "SELECT DISTINCT(tbl_committee.id),project_name, tbl_application.id AS aid, department, tbl_application.regis_id FROM tbl_committee RIGHT JOIN tbl_application ON tbl_application.id = tbl_committee.id ORDER BY tbl_committee.id";
$rsValue = mysql_query($sql) or die("Select error2 : ".mysql_error());
$num_rows = mysql_num_rows($rsValue);
if($num_rows>0){
header("Pragma: public");
header("Expires: 0");
header("Cache-Control: must-revalidate, post-check=0, pre-check=0"); 
header("Content-Type: application/force-download");
header("Content-Type: application/octet-stream");
header("Content-Type: application/download");;
header("Content-Disposition: attachment;filename=total-score.xls "); 
?>
<?php echo '<?xml version="1.0" encoding="utf-8"?>'; ?>

<?php echo'<?mso-application progid="Excel.Sheet"?>';?>

<Workbook xmlns="urn:schemas-microsoft-com:office:spreadsheet"
 xmlns:o="urn:schemas-microsoft-com:office:office"
 xmlns:x="urn:schemas-microsoft-com:office:excel"
 xmlns:ss="urn:schemas-microsoft-com:office:spreadsheet"
 xmlns:html="http://www.w3.org/TR/REC-html40">
 <Styles>
  <Style ss:ID="Default" ss:Name="Normal">
   <Alignment ss:Vertical="Bottom"/>
   <Borders/>
   <Font x:CharSet="222"/>
   <Interior/>
   <NumberFormat/>
   <Protection/>
  </Style>
 </Styles>
 <Worksheet ss:Name="รวมคะแนนคณะกรรมการกลั่นกรอง">
  <Table ss:ExpandedColumnCount="<?=$item[$i]?>" ss:ExpandedRowCount="<?=$num_rows+1?>" x:FullColumns="1"
   x:FullRows="1">
   <Row>
    <Cell><Data ss:Type="String">ลำดับที่</Data></Cell>
    <Cell><Data ss:Type="String">รหัสเอกสาร</Data></Cell>
    <Cell><Data ss:Type="String">ชื่อโครงการ</Data></Cell>
    <Cell><Data ss:Type="String">หน่วยงาน</Data></Cell>
<?php
for($i=0;$i<count($item_id);$i++){
?>
    <Cell><Data ss:Type="String"><?=$item[$i]?></Data></Cell>
<?php
}
?>
   </Row>
<?php
while($ListValue = mysql_fetch_assoc($rsValue)){
?>
   <Row>
    <Cell><Data ss:Type="Number"><?=$rs['id']?></Data></Cell>
    <Cell><Data ss:Type="String"><?=$rs['regis_id']?></Data></Cell>
    <Cell><Data ss:Type="String"><?=$rs['project_name']?></Data></Cell>
    <Cell><Data ss:Type="String"><?=$rs['department']?></Data></Cell>
<?
for($i=0;$i<count($item_id);$i++){ 
$sql = "SELECT ret FROM tbl_committee WHERE id={$ListValue['id']} AND user_id={$item_id[$i]}";
$rsColValue = mysql_query($sql) or die("Select error : ".mysql_error());
$ColValue = mysql_fetch_assoc($rsColValue); 
?>
    <Cell><Data ss:Type="Number"><?=number_format($ColValue['ret'])?></Data></Cell>
<?php
mysql_free_result($rsColValue); 
}//end for 
}//end while 
mysql_free_result($rsValue); 
?>

   </Row>
  </Table>
<?
}
else{
echo "<p align='center'><strong>ไม่มีข้อมูล</strong></p>";
}
?>
<?
mysql_close(); 
?>
<WorksheetOptions xmlns="urn:schemas-microsoft-com:office:excel">
   <Selected/>
   <ProtectObjects>False</ProtectObjects>
   <ProtectScenarios>False</ProtectScenarios>
  </WorksheetOptions>
 </Worksheet>
</Workbook>