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-   -   How exactly do SQL Subqueries work? (https://vborg.vbsupport.ru/showthread.php?t=211813)

Jaxel 04-21-2009 08:34 AM
How exactly do SQL Subqueries work?
 
I'm trying to figure this one out... I have one query... that returns a set of rows.

Code:
$villages = $vbulletin->db->query_read("
        SELECT conquest_players.*, conquest_nations.*, user.username
        FROM conquest_players AS conquest_players
        LEFT JOIN conquest_nations AS conquest_nations ON conquest_players.nationID = conquest_nations.nationID
        LEFT JOIN user AS user ON conquest_players.forumID = user.userid
        ORDER BY user.username ASC
");
I am pulling each row with a while loop...

Code:
while ($village = $vbulletin->db->fetch_array($villages))
{
        $intel = $vbulletin->db->query_first("
                SELECT * FROM conquest_intel
                WHERE playerID = ".$player[playerID]."
                AND villageID = ".$village[playerID]."
        ");

        eval('$villagesHTML .= "' . fetch_template('conquest_villages_bit') . '";');
}
This works great, but the problem is that if I am paginating the results by 30 listings, then the $intel query adds an extra 30 queries per page. I'm wondering if there was a way I could combine the two SQL statements together


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