What is your code?
I assume that you are using a loop to move through your result set, if so then just modify where you print your <tr> and <td>'s.
for ($i = 0; $i < count($result_set); $i++) {
if (!$i%2) { //Check to see if we are even
print "<tr>\n";
}
print "<td>$resutlset[$i]</td>";
if (!$i%2) { //Check to see if we are even
print "</tr>\n";
}
}
Something like that will give you a 2 column table.