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Zend_Db subquery

I am trying to build a sql query with ZendFW, but I cannot make it function the way I want (or even work). This is a query that works, which I am trying to build with zend_db select ()

SELECT tc.trip_title, td.ID, td.trip_id, 
  (SELECT count(*) FROM 'trips_invites' ti 
   WHERE ti.destination_id=td.ID AND ti.accepted ='NR') AS "pending_invites" 
FROM `trips_current` AS `tc`, `trips_data` AS `td` 
WHERE (tc.ID=td.trip_id) AND (tc.creator_id = '1') 
ORDER BY `trip_id` ASC

I can't figure out how to properly get this subquery there, and nothing I try seems to work.

Any help would be greatly appreciated!

Thank!

Edit / Response: If anyone has the same problem, based on the suggestion below, I will reprocess the request as follows:

SELECT `tc`.`trip_title`, `td`.`ID`, `td`.`trip_id`, count(TI.ID)
FROM `trips_current` AS `tc` 
INNER JOIN `trips_data` AS `td` ON td.trip_id = tc.ID 
LEFT JOIN trips_invites AS TI ON ti.destination_id = td.id
WHERE tc.creator_id = 1  AND ti.accepted='NR'
GROUP BY td.id
ORDER BY `trip_id` ASC

which with ZendFW I created as follows:

$select = $this->dblink->select() 
->from(array('tc' => 'trips_current'),
      array('trip_title'))
->join(array('td' => 'trips_data'), 
'td.trip_id = tc.id',                   
      array('ID','trip_id'))
->joinLeft(array('ti'=>'trips_invites'),
     'ti.destination_id = td.id',
     array('COUNT(ti.id)'))
->where('tc.creator_id =?',1)
->group('td.id')
->order('trip_id');
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1 answer

, GROUP BY:

$select = $db->select()
  ->from(array("tc"=>"trips_current"), array("trip_title"))
  ->join(array("td"=>"trips_data"), "td.trip_id = tc.ID", array("ID", "trip_id"))
  ->joinLeft(array("ti"=>"trips_invites"), "ti.destination_id = td.ID", array("COUNT(*)")
  ->where("tc.creator_id = ?", 1)
  ->group(array("tc.ID", "td.ID"))
  ->order("trip_id");

, MySQL. - MySQL.

edit: joinLeft() ti. , , .

, , :

$subquery = $db->select()
  ->from(array("ti"=>"trips_invites", "COUNT(*)")
  ->where("ti.destination_id = td.ID");

$select = $db->select()
  ->from(array("tc"=>"trips_current"), array("trip_title", "($subquery)"))
  ->join(array("td"=>"trips_data"), "td.trip_id = tc.ID", array("ID", "trip_id"))
  ->where("tc.creator_id = ?", 1)
  ->order("trip_id");

Zend_Db_Select , , , .

, Zend_Db_Select , . , , . SQL- , - , .

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