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Not unique table/alias


Sware

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I was doing fine and all of a sudden..

Bam!
Not unique table/alias: 'phpbb_posts'

I'm new to MySQL and trying to create a portal with phpBB.

$query = "SELECT phpbb_posts.poster_id, phpbb_users.username ".
"FROM phpbb_posts, phpbb_users".
"WHERE phpbb_posts.poster_id = phpbb_users.poster_id";

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


// Print out the contents of each row into a table
while($row = mysql_fetch_array($result)){
echo $row['poster_id'];
echo $row['username'];
echo "<br />";
}

Just a little test but it shows that error, ANY help will be thanked for.
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How do I add another join onto that
[code]SELECT phpbb_posts.poster_id, phpbb_users.username FROM phpbb_posts JOIN phpbb_users ON phpbb_posts.poster_id = phpbb_users.poster_id (+ ANOTHER JOIN)[/code]

or can you not do that?
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