รบกวนพี่ๆช่วยชี้แนะหน่อยครับ จะโชว์ข้อมูลตามเงื่อนไขครับโดยเวลาโชว์จะโชว์อีกหน้านึงครับ แต่ข้อมูลมันไม่โชว์ตามเงื่อนไขผมครับ

<?php
include"db/functiondate.php";
include"config.inc.php";
$con = mysql_connect($host,$username,$password);
if (!$con)
  {     die('Could not connect: ' . mysql_error());    }
  mysql_select_db($database, $con);
  mysql_query("SET NAMES UTF8");
  
///header('Content-type: application/ms-word'); //การผลเป็นไฟล์ word 
///header('Content-Disposition: attachment; filename=รายงานสินค้ารายวัน.doc'); 
 ?>

<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<link rel="stylesheet" media="all" type="text/css" href="js/jquerydatepicker/jquery-ui.css" />
		<link rel="stylesheet" media="all" type="text/css" href="js/jquerydatepicker/jquery-ui-timepicker-addon.css" />
		<script type="text/javascript" src="js/jquerydatepicker/jquery-1.10.2.min.js"></script>
		<script type="text/javascript" src="js/jquerydatepicker/jquery-ui.min.js"></script>

		<script type="text/javascript" src="js/jquerydatepicker/jquery-ui-timepicker-addon.js"></script>
<script type="text/javascript" src="js/jquerydatepicker/jquery-ui-sliderAccess.js"></script>
<script language="javascript">
$(function(){
	$("#date_in").datepicker({
		dateFormat: 'yy-mm-dd',
		numberOfMonths: 2,
	});
});


	</script>



<?php
$date_in=$_REQUEST['date_in'];
$month=$_REQUEST['month'];
$year=$_REQUEST['year'];
$num=0;
if($date_in==""){
	$msg="รายงานสินค้าทั้งหมด";
$sql="select * from products,p_status where products.id_status=p_status.id_status  order by products.id_pro desc";
}elseif($date_in!=""){
	$msg="รายงานสินค้าประจำวัน";
	$day_start=$date_in;
$sql="select * from products,p_status where products.id_status=p_status.id_status and products.date_in='$day_start' order by products.id_pro desc";
}elseif($month!="" and $year!=""){
	$msg="รายงานการส่งสินค้าประจำเดือน";
	$day_start=$year."-".$month."-01";
	$day_end=$year."-".$month."-31";

	$sql="select * from products,p_status where products.id_status=p_status.id_status and products.date_in between '$day_start' and '$day_end' order by products.id_pro desc";
///$sql="select * from tb_member,tb_order,tb_shipping where tb_shipping.id_order=tb_order.id_order and tb_order.id_mem=tb_member.id_mem and tb_order.status_order='3' and tb_shipping.day_shipping between '$day_start' and '$day_end' order by tb_shipping.id_order desc";
}elseif($month=="" and $year!=""){
	$msg="รายงานการส่งสินค้าประจำปี";
	$day_start=$year."-01-01";
	$day_end=$year."-12-31";
$sql="select * from products,p_status where products.id_status=p_status.id_status and products.date_in between '$day_start' and '$day_end' order by products.id_pro desc";
}
$result=mysql_query($sql);
if($result!=""){
$Num_Rows=mysql_num_rows($result);
}?>
<?php
		if($Num_Rows==0){
			echo"<center><font color='red'><br><br><br>ไม่พบข้อมูลในระบบ<br><br><br></font></center>";
		}else{
			echo"$msg";
			?>
<table width="98%" border="1" cellspacing="0" cellpadding="3">
    <tr style="color:#FFF;">
      <td width="5%" align="center" bgcolor="#8B8682">ลำดับ</td>
      <td width="17%" align="center" bgcolor="#8B8682">ชื่อสินค้า</td>
      <td width="14%" align="center" bgcolor="#8B8682">วันที่รับสินค้า</td>
      <td width="12%" align="center" bgcolor="#8B8682">สถานะสินค้า</td>
      <td width="16%" align="center" bgcolor="#8B8682">เอกสารการ ซื้อ - ขาย</td>
      <td width="21%" align="center" bgcolor="#8B8682">สินค้าคงเหลือ</td>
      <td width="15%" align="center" bgcolor="#8B8682">ยอดสั่งซื้อ</td>
    </tr>
    <?php
			$no=1;
			while($read=mysql_fetch_array($result)){
				$id_pro=$read[id_pro];
				$id_status=$read[id_status];
				$name_pro=$read[name_pro];
				$date_in=$read[date_in];
				$price_unit=$read[price_unit];
				$product_on_hand=$read[product_on_hand];
				$amount_received=$read[amount_received];
				$total_cost=$read[total_cost];
				$n_status=$read[n_status];
				$total=$total+$total_order;
				if($bg=="#FFFFFF"){
				$bg="#FFFFFF";
			}else{
				$bg="#FFFFFF";
			}
			?>
  <tr  bgcolor="<?php echo"$bg"; ?>">
      <td align="center"><?php echo"$no"; ?></td>
      <td><?php echo"$name_pro"; ?></td>
      <td align="center"><span style="border-bottom:#F90 dashed 1px">
        <? $strDate = "$date_in";echo "".DateThai($strDate); ?>
      </span></td>
      <td align="center"><? echo"$n_status"; ?>&nbsp;</td>
      <td align="center">[<a href="../order_review.php?id_order=<?php echo"$id_order"; ?>" target="_blank">ใบสั่งซื้อ</a>][<a href="review.php?id_order=<?php echo"$id_order"; ?>" target="_blank">ใบส่งของ</a>]</td>
      <td align="center"><? echo"$product_on_hand";?>&nbsp;</td>
      <td align="right"><?php echo"".number_format($total_order).""; ?>&nbsp;บาท</td>
    </tr>
    <?php
			$no++;
			}
			?>
    <tr style="color:#FFF;">
      <td colspan="6" align="right" bgcolor="#666666">รวมยอดสั่งซื้อทั้งหมด</td>
      <td align="right" bgcolor="#666666"><?php echo"".number_format($total).""; ?>&nbsp;บาท</td>
    </tr>
  </table>

  <?php
		}
		?>