ช่วยด้วยคับ ผมต้องการการคำนวณข้ามตารางคับ ผมลองทำแล้วมันไม่ได้

$sql1 = "select * from leavetype where leavetypeid = $roww[leavetypeid]";
$sql2 = mysql_query($sql1);
$row1 = @mysql_fetch_array($sql2);
$qq = $row1[leavequota];
$leavequota = "select * from leavemanager where leavetypeid = $row2[leavetypeid]";
$amountdate1 = mysql_query($leavequota);
$row2 = @mysql_fetch_array($amountdate1);
$total = $qq - $row2[amountdate];

$Qu=mysql_query("select * from leavemanager, leavetype where leavetype.leavetypeid=$roww['leavetypeid'] and leavemanager.leavetypeid=$row2['leavetypeid']");
$Re=mysql_fetch_array($Qu);

$X=$Re['leavetype'] - $Re['amountdate'];