Wrong result with php - php

Question

I am running a script to get some posts from a database.
Here is the script:
private function getItems()
{
$this->dbConnect($detailsTable);
mysql_select_db(DB_NAME);
mysql_query('SET NAMES utf8');
mysql_query('SET CHARACTER SET utf8');
$result = mysql_query('SELECT *
FROM wp_posts, wp_term_relationships,wp_term_taxonomy
WHERE wp_posts.post_status = "publish"
AND wp_term_relationships.object_id = id
AND wp_term_taxonomy.taxonomy= "category"
AND !(wp_term_taxonomy.term_taxonomy_id = 11)
AND wp_term_relationships.term_taxonomy_id = wp_term_taxonomy.term_taxonomy_id
ORDER BY wp_posts.post_date DESC LIMIT 25', LINK);
mysql_close(LINK);
$items = '';
while($row = #mysql_fetch_array($result))
{
$title = UTFayar($row['post_title']);
$content = UTFayar($row['post_content']);
$items .= '<item id="'.$row["ID"].'">
<title><![CDATA['.$title.']]></title>
<description><![CDATA['. $content .']]></description>
<pubDate>'.date('D, j M Y H:i:s T', strtotime($row['post_date'])).'</pubDate>
<category>'.$row['post_category'].'</category>
</item>';
}
$items .= '</channel>
</rss>';
return $items;
}
The problem is that some posts are in 3+ categories.
So I get a wrong result, I get same post 3+ times successively. I need that this post even if is at more then one category to be showed in my rss only 1 time.
EIDTED:
Here is right code, if some one will need it:
private function getItems()
{
$this->dbConnect($detailsTable);
mysql_select_db(DB_NAME);
mysql_query('SET NAMES utf8');
mysql_query('SET CHARACTER SET utf8');
//$result = mysql_query ('SELECT * FROM wp_posts WHERE post_status="publish" and post_category!=17 and post_category!=18 ORDER BY post_date DESC LIMIT 20', LINK);
$result = mysql_query('SELECT
ID
, post_title
, post_content
, post_date
, group_concat(DISTINCT post_category ORDER BY post_category DESC SEPARATOR ", " ) as "categories"
FROM wp_posts, wp_term_relationships,wp_term_taxonomy
WHERE wp_posts.post_status = "publish"
AND wp_term_relationships.object_id = id
AND wp_term_taxonomy.taxonomy= "category"
AND !(wp_term_taxonomy.term_taxonomy_id = 11)
AND wp_term_relationships.term_taxonomy_id = wp_term_taxonomy.term_taxonomy_id
GROUP BY ID, post_title, post_content, post_date ORDER BY wp_posts.post_date DESC LIMIT 25', LINK);
mysql_close(LINK);
$items = '';
while($row = #mysql_fetch_array($result))
{
$title = UTFayar($row['post_title']);
$content = UTFayar($row['post_content']);
$items .= '<item id="'.$row["ID"].'">
<title><![CDATA['.$title.']]></title>
<description><![CDATA['. $content .']]></description>
<pubDate>'.date('D, j M Y H:i:s T', strtotime($row['post_date'])).'</pubDate>
<category>'.$row['categories'].'</category>
</item>';
}
$items .= '</channel>
</rss>';
return $items;
}

Answer 1

The problem is that you need to deal with the categories in some way.... rolling them up and displaying them in a list with commas may be a good way to deal with it.
mysql has a nice function called "GROUP_CONCAT" http://dev.mysql.com/doc/refman/5.0/en/group-by-functions.html#function_group-concat
your query would be
SELECT
ID
, post_title
, post_content
, post_date
, group_concat(DISTINCT post_category ORDER BY post_category DESC SEPARATOR ', ' ) as `categories`
FROM wp_posts, wp_term_relationships,wp_term_taxonomy
WHERE wp_posts.post_status = "publish"
AND wp_term_relationships.object_id = id
AND wp_term_taxonomy.taxonomy= "category"
AND !(wp_term_taxonomy.term_taxonomy_id = 11)
AND wp_term_relationships.term_taxonomy_id = wp_term_taxonomy.term_taxonomy_id
GROUP BY ID
, post_title
, post_content
, post_date
ORDER BY wp_posts.post_date DESC