数据查询问题

require_once './config/conn.php';$asin='6007-00A';$sql="SELECT t.`item_code`,t.`package_area`,t.`asin`,t.`sku`,b.`pack_weight` FROM `1_sku_comparison` t left join `1_product` b on t.`item_code`=b.`item_code` WHERE t.`sku`='".$asin."' OR t.`asin`='".$asin."' OR t.`item_code`='".$asin."'";$query=mysql_query($sql);$rs=mysql_fetch_array($query);$num= mysql_affected_rows();echo $sql."</br>";while($rs=mysql_fetch_array($query)){echo $rs['pack_weight'];echo $rs['item_code'];echo $rs['package_area'];echo "</br>";}