Titles by meta values

<?php

// List post titles by Business Category, Subcategory
$sql = "
SELECT p.*,m1.meta_value as category, m2.meta_value as subcategory
FROM $wpdb->posts p
JOIN $wpdb->postmeta m1 ON (p.ID = m1.post_id AND m1.meta_key = 'Business Category')
JOIN $wpdb->postmeta m2 ON (p.ID = m2.post_id AND m2.meta_key = 'Subcategory')
WHERE p.post_type = 'post'
   AND p.post_status = 'publish'
ORDER BY m1.meta_value, m2.meta_value, p.post_title
";
$all_posts = $wpdb->get_results($sql);
$curr_cat = '';
$curr_subcat = '';
$in_list = false;
foreach ($all_posts as $post) {
   setup_postdata($post);
   $this_cat = $post->category;
   $this_subcat = $post->subcategory;
   if ($this_cat != $curr_cat) {
      $curr_cat = $this_cat;
      if ($in_list) {
         echo "</ul>\n";
         $in_list = false;
      }
      echo "<h2>$curr_cat</h2>\n";
      $curr_subcat = '';
   }
   if ($this_subcat != $curr_subcat) {
      $curr_subcat = $this_subcat;
      if ($in_list) {
         echo "</ul>\n";
      }
      echo "<h3>$curr_subcat</h3>\n";
      echo "<ul>\n";
      $in_list = true;
   } ?>
   <li><a href="<?php echo get_permalink($postid); ?>" title="<?php the_title(); ?>"><?php the_title(); ?></a></li>
<?php }
if ($in_list) echo "</ul>\n";

?>