PHP Mysql Left Join - 


<?php $q = mysql_query("select sub_cat.*, links.*                  links                  left join sub_cat                  on links.p_id = sub_cat.id                  sub_cat.p_id = '$id'                  order name asc") or die (mysql_error());  while ($r = mysql_fetch_assoc($q)) {     $links_name = $r['name'];     $link_h3 = $links_name != '' ? '<h3>' . $links_name . '</h3>' : '';     //print $link_h3;     print '<pre>';     print_r ($r); } ?>

i have 2 tables rows like:

sub_cat

  • id
  • name
  • p_id

links

  • id
  • links
  • p_id

in sub cat have movie categories, foreign language movies, national movies, uncategorised movies , on. in links table have concrete movie links , depending on sub category.

the thing not want dublicate titles (sub_cat.name). result is:

without category www.moviesite.com

without category www.moviesite2.com

without category www.moviesite3.com

foreign movies www.moviesite1.bla

foreign movies www.moviesite2.bla

i want be

without category www.moviesite.com

www.moviesite2.com

www.moviesite3.com

foreign movies www.moviesite1.bla

www.moviesite2.bla

and not have idea how :(

any appreciated.

to job, have 2 solutions:

the first solution process data before showing it, in order group movies category.

you can example:

$moviesbycategory = array();  while ($r = mysql_fetch_assoc($q)) {     // create new sub array new category if necessary     if (!isset($moviesbycategory[$r['name']]))         $moviesbycategory[$r['name']] = array();      // add movie in category     $moviesbycategory[$r['name']][] = $r['links']; }

and then, can iterate on new array like

foreach($moviesbycategory $category => $movies) {     // print category name     echo '<h1>' . $category . '</h1>';      // print movies of category     foreach($movies $movie)         echo '<h3>' . $movie . '</h3>'; }

the second solution modify sql query group directly movies have same category. have use group by clause on sub_cat.id , apply agregate function on other fields in select.

for performance aspect, best solution sql solution, doing php give more flexibility presentation.


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