สอบถามเรื่อง ดึงตารางมาจากฐานข้อมูลแล้วมันมีค่าตัวเลขมาจากไหนไม่รู้ค่ะ

<?php
	include("connect01.inc");

	$day_t0 = date("d-m-Y");
	list($d, $m, $Y) = explode("-", $day_t0);
	$Y = $Y+543;
	$com_value = array("$d", "$m", "$Y");
	$day_t1 = implode("-", $com_value);

	$db = "asteriskproj";
	$result = mysql_select_db($db);
	mysql_query("SET NAMES UTF8");
	if(!$result){
		die('Could not find database called asteriskproj: '. mysql_error());
	}
	$sql = "SELECT member.name, stadium.stadium, time_fix.ti_fix FROM (member, stadium, time_fix) WHERE (member.id_card = stadium.namer and time_fix.num_fix = stadium.time and need_date = '$day_t1')";
	$result = mysql_query($sql);
	$num_rows = mysql_num_rows($result);
	$num_fields = mysql_num_fields($result);

	echo "<center>";
	echo "<table bgcolor=00ff7f width=750px border=1px><tr><th>ชื่อผู้จอง</th><th>สนามที่</th><th>เวลาที่จอง</th></tr>";

	
	$col = mysql_query($result);
	while($row = mysql_fetch_row($col)) 
	{
	echo "<th>$row[0]</th>";
	}
	echo "</tr>";

	$i = 0;
	while($i<$num_rows){
	$data = mysql_fetch_array($result);
	echo "<tr align=\"center\">";
	for($j=0; $j<$num_fields; $j++){
		echo "<td>$data[$j]</td>";
	}
	echo "</tr>";
	$i++;
	}

	echo "$num_rows";
	echo "$num_fields";
	echo "</table></center>";
	mysql_close($link);
?>