remove duplicates in a query

[gdfhghjdfghgfhf]

I use this code to display the last posts from my phpbb forum

$query = "SELECT post_subject, topic_id from phpbb_posts ORDER BY post_id DESC LIMIT 15"; 

$res = mysql_query($query) or die(mysql_error());   

while($row = mysql_fetch_array($res)) { 
$title = substr($row["post_subject"], 0, 30);
$topic_id = $row["topic_id"];
$post_id = $row["post_id"];
echo " <a href=\"viewtopic.php?f=5&t=$topic_id#p$post_id\" title=\"$title\">";
echo $title;
echo "</a>..<br>";
}

 

But if a topic has multiple new replys, it will list the topic multiple time. How can i remove the duplicate results? (keep only the last post of the topic)

 

Exemple:

Re: topic2

Re: topic1

Re: topic3

Re: topic1

Re: topic1

Re: topic4

 

Would be:

 

Re: topic2

Re: topic1

Re: topic3

Re: topic4

 

thanks a lot!

[ialsoagree]

Use "SELECT DISTINCT" instead of "SELECT".

 

The distinct keyword tells MySQL not to include the same row more than once in the result set.

[MasterK]

I believe you just need to make it SELECT DISTINCT here..

$query = "SELECT post_subject, topic_id from phpbb_posts ORDER BY post_id DESC LIMIT 15"; 

 

So like this..

 

$query = "SELECT DISTINCT post_subject, topic_id from phpbb_posts ORDER BY post_id DESC LIMIT 15"; 

 

 

[gdfhghjdfghgfhf]

doesn't work, maybe because there is 1 row for each reply but only 1 row for the topic..... i don't know, i'm really a newbie :/