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bob_the _builder

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I am writing a basic forum. I am struging to grab the last poster for display in the forum index.


My table layout is:


CREATE TABLE headings ( 
  headingid int(5) NOT NULL auto_increment, 
  heading varchar(50) NOT NULL,
  description varchar(255) NOT NULL,
  PRIMARY KEY (headingid) 

CREATE TABLE topics ( 
  topicid int(5) NOT NULL auto_increment, 
  headingid int(5) NOT NULL,
  userid int(5) NOT NULL, 
  views int(5) NOT NULL, 
  topic varchar(50) NOT NULL, 
  PRIMARY KEY (topicid) 

  postid int(5) NOT NULL auto_increment, 
  topicid int(5) NOT NULL,
  userid int(5) NOT NULL,  
  Post text NOT NULL,
  added datetime NOT NULL,
  viewed int(5) NOT NULL,
  PRIMARY KEY (postid) 


On the page where the headings are displayed I am trying to show the last poster for each heading.


I have tried with no luck, here is what I have at the moment which is no where near correct:


	$sql = mysql_query("SELECT u.first_name, u.first_name, p.added
FROM topics as t
LEFT JOIN posts as p ON t.topicid = p.topicid
LEFT JOIN users as u ON u.userid = p.userid
LEFT JOIN headings as h ON h.headingid = t.headingid
WHERE t.headingid = h.headingid
ORDER BY t.topicid DESC LIMIT 1") or die (mysql_error());
while ($row1 = mysql_fetch_array($sql)) {

$sql = mysql_query("SELECT * FROM headings");
while ($row = mysql_fetch_array($sql)) {




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Can anyone confirm this wacky notion:


SELECT headings.headingid
    , headings.heading
    , topics.topic
    , posts.userid
    , posts.added
    , posts.post
FROM headings
    LEFT JOIN topics ON headings.headingid = topics.headingid
    LEFT JOIN posts ON topics.topicid = posts.topicid AND concat(posts.topicid, posts.added) IN (
         SELECT concat(topicid, max(added)) AS most_recent
         FROM posts GROUP BY topicid 
GROUP BY headings.headingid

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