php - Why this query doesn't works -

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i not confirmed query... feel somewhere cu or ci has been misplaced... query worked without using $db->namequote in sql. 

 $query = 'select '. $db->namequote(cu.'id')         .' '. $db->namequote('#__users'), $db->namequote('#__community_cinvit' ci)         .' '. $db->namequote(cu.'email').'='.$db->quote(ci.'to_email')         .'and'. $db->namequote(ci.'point_given').'='.$db->quote('1');          $db->setquery($query);         $conn = $db->loadresult();         echo $conn;

is there error in cu , ci

add white space before .' and'. , add cu $db->namequote('#__users' cu)

 $query = 'select '. $db->namequote(cu.'id')         .' '. $db->namequote('#__users' cu), $db->namequote('#__community_cinvit' ci)         .' '. $db->namequote(cu.'email').'='.$db->quote(ci.'to_email')         .' and'. $db->namequote(ci.'point_given').'='.$db->quote('1');          $db->setquery($query);         $conn = $db->loadresult();         echo $conn;

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