<?
$w=$GLOBALS['db']->query("select id from ecmproducts");
while($r=$GLOBALS['db']->fetchByAssoc($w)){
	$sql = "update ecmproducts set commission_rate=(srp_price/(1+vat_value/100)-purchase_price)/(srp_price/(1-vat_value/100)); where id='".$r['id']."'"; 
	$GLOBALS['db']->query($sql);
}
?>