I have this code for single connection

$query = "SELECT b.*, u.nick, u.rate_sum FROM " . $DBPrefix . "bids b
LEFT JOIN " . $DBPrefix . "users u ON (u.id = b.bidder)
WHERE b.auction = " . $id . " ORDER BY b.bid DESC, b.quantity DESC, b.id DESC";
$result_numbids = mysql_query($query);
$system->check_mysql($result_numbids, $query, __LINE__, __FILE__); but i want to make it 2 tables et 2nd table name is users_buyers how do i add it

si 'et' en francais es siempre como 'and' en ingles then. . .

Are you trying to use left join for two tables or what? or you want
to split el data into dos mesas (tables)?

Left inner right anything that will display the other result without problems tiens

Caramba! Maybe if you post a sample of the DDL and possible some Insertions someone might be able to help you do the join properly.
Joining is one serious headache i run away from except i am teaching in a class or oracle or mysql. The easiest join is still the cartesian
join, the inner joins are headaches sometimes.

$query = "SELECT b.*, u.nick, u.rate_sum FROM " . $DBPrefix . "bids b
LEFT JOIN " . $DBPrefix . "users u ON (u.id = b.bidder)
WHERE b.auction = " . $id . " ORDER BY b.bid DESC, b.quantity DESC, b.id DESC";
$result_numbids = mysql_query($query);
$system->check_mysql($result_numbids, $query, __LINE__, __FILE__);

$num_bids = mysql_num_rows($result_numbids);
$i = 0;
$left = $auction_data['quantity'];
$hbidder_data = array();
while ($bidrec = mysql_fetch_assoc($result_numbids))
{
if (!isset($bidderarray[$bidrec['nick']])) {
if ($system->SETTINGS['buyerprivacy'] == 'y' && $user->user_data['id'] != $auction_data['user'] && $user->user_data['id'] != $bidrec['bidder'])
{
$bidderarray[$bidrec['nick']] = $MSG['176'] . ' ' . $bidderarraynum;
$bidderarraynum++;
}
else
{
$bidderarray[$bidrec['nick']] = $bidrec['nick'];
}
}
if ($left > 0 && !in_array($bidrec['bidder'], $hbidder_data))


iwont to add another table usersbuyers

Mehn, this your question is not clear to me at all. My suggestion, take a little time out and learn how to join in mysql, it is not as hard as it is.
First, learn the different types of joins so that you will know which one will be the best and learn examples, then apply it to what you are trying
to do.
Hasta la vista. . . .