<?php

  // Example
  $heading_column = '<whatever is the name of your heading column>';
  $last_heading = null;
 
  while($row = your_fetch_assoc_statement){
        // detect a change in the heading value and output the new heading
        if($last_heading != $row[$heading_column]){

$sql = ......
$result = mysql_query($sql,$connection)
or die("Couldn't execute SELECT query");
 
while ($row = mysql_fetch_array($result)) {
......
}

while ($row = mysql_fetch_array($result)) {
......