Penjumlahan tabel dinamis

Bagaimana cara menghubungkan Tabel Dinamis ke database, untuk membuat penjumlahan?

<?php
	$crtable = '';
	if ($_POST){
		$crtable .= '<table border="1"><tr>
		<th>No</th>
		<th>Nama Siswa</th>';
		for ($no=1,$j =0; $j < $_POST['colunn']; $j++) {
			$crtable .= '<td>'.$no++.'</td>';
			}
			$crtable .= '</th>';
		for ($no=1, $i = 0; $i < $_POST['line']; $i++) {
			$crtable .= '<tr><td>'.$no++.'</td>
			             <td width="3"><input type="text" name="nama" size="30"></td>';
			for ($j = 0; $j < $_POST['colunn']; $j++) {
			$crtable .= '<td width="30"><input type="text" name="nama" size="3"></td>';
			}
			$crtable .= '</tr>';
		}
		$crtable .= '</table>';
	}
?>
<form action="" method="post">
	<table border="0" width="300">
		<tr>
			<td width="80"><label>Banyak Soal:</label></td>
			<td width="120"><input type="text" name="colunn"></td>
		</tr>
		<tr>
			<td><label>Banyak Siswa:</label></td>
			<td><input type="text" name="line"></td>
		</tr>
		<tr>
			<td colspan="2" align="right">
				<input type="submit" value="Create Table">
			</td>
		</tr>
	</table>
</form>
<br/>
<br/>

<?php
	echo $crtable;
?>