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php怎么调用两个关联数据表里的数据

$query = $db->query("SELECT list_dir,list_id,list_name,list_status FROM ff_list WHERE list_status != 0 ORDER BY list_id ASC LIMIT 0, 30");<br />while($n = $db->fetch_array($query)) {<br /><br /><br />$query = $db->query("SELECT vod_name,vod_cid FROM ff_vod WHERE vod_cid in ($n['list_id']) ORDER BY rand() LIMIT 0, 10");<br />while($m = $db->fetch_array($query)) {<br /><br />        $z[]='<div class="linkbox"><h3><a href='."'/".$n['list_dir']."/'>".$n['list_name'].$m['vod_name'].'</a></h3></div>';<br />}<br />}


怎么双重while调用 ,或者用其它的调用方法调用达到我相要的效果
ff_list数据表是栏目列表
ff_vod是文章列表
两表的关联字段是:vod_cid=list_id
就是吧ff_list里的所有栏目名称调用出来,然后在栏目名称下面显示10条文章,怎么一次性调用出来,看好多论坛或CMS都可以


例如:
栏目名称:军事新闻
aaaaaaaaaaaaaaaaa
bbbbbbbbbbbbbbbbb
ccccccccccccccccc
ddddddddddddddddd
eeeeeeeeeeeeeeeee

栏目名称:娱乐新闻
ffffffffffffffffff
gggggggggggggggggg
hhhhhhhhhhhhhhhhhh
...........


小弟是菜鸟,麻烦知道的大哥直接给代码,谢谢了

';   

这样不行么?
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