สอบถามหาค่า LastID จาก table โดยใช้ odbc connect ฐานข้อมูล mssql ครับ

$buildflSQL = "INSERT INTO buildfl (floor)VALUES ('".$_POST["floor"]."')";
$objExec = odbc_exec($con,$buildflSQL);

if($objExec)
{
		
		
		echo "done";
}
else
{
	echo "Error Save [".$buildflSQL."]";
}

$last = "SELECT floorid AS LastID FROM buildfl WHERE floorid = @@Identity";
$lastExec = odbc_exec($con,$last);
if($lastExec)
{
		
		
		echo "last = [".$last."]";
}