请教以上代码哪里有有关问题

请问以下代码哪里有问题

PHP code

<?PHP$id=$_GET['number'];include("conn.php");$Date = date("YmdHis");$Filename = $Date.".csv";$Table = isset($_GET['tid'])?$_GET['tid']:''; header("Content-type:application/vnd.ms-excel");header("Content-Disposition:filename=".$Filename);echo "SKU,product-name,sum(quantity),\r\n"; $Sql = "select *,sum(`quantity-purchased`) from sale_orders WHERE `number`=$id group by `jj_sku`"; $Result = mysql_query($Sql);  while($rs = mysql_fetch_array($Result) ){   $j_sku=$rs['jj_sku'];   $Sqlpr = "SELECT `product-name` FROM `product_co` WHERE `jj_sku`=$j_sku"; $Resulta = mysql_query($Sqlpr,$conn); $resultaa= mysql_fetch_row($Resulta);$pro-nm=$resultaa[0]; echo $rs['jj_sku'].",".$pro-nm.",". $rs['sum(`quantity-purchased`)']." \r\n ";     }?>

  $Sqlpr = "SELECT `product-name` FROM `product_co` WHERE `jj_sku`=$j_sku";
 $Resulta = mysql_query($Sqlpr,$conn);
 $resultaa= mysql_fetch_row($Resulta);
$pro-nm=$resultaa[0];
我觉得以上代码有问题，请问应该怎么写呢？

[解决办法]
$Sqlpr = "SELECT `product-name` FROM `product_co` WHERE `jj_sku`='$j_sku'";

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