Question

Have this result set below; am trying to insert the red numbers into post_position – start from 1, as many rows as there are for each topic_id.

Can this be done using a simple query in phpMyAdmin, or do I need to use PHP? (if I need PHP, can you help with a brief snippet?)

Answer 1

Bro i think is a worst designed table 🙁 add

id

for each value;

after make php:

$result = mysql_query("SELECT * FROM <table> ORDER BY topic_id, id");
$count = 1;
while($r = mysql_fetch_assc($result){
     if(!isset($topic_id) || $topic_id != $r['topic_id]){
         $topic_id = $r['topic_id];
         $count = 1;
     }
     mysql_query("UPDATE <table> SET post_position = {$count} WHERE `id` = {$r['id'}");
     $count++;
}