Zend框架2 - SQL子查詢

Question

我想在ZF 2.運行一個特殊的SQL查詢

SELECT listingId, COUNT(*) as num 
FROM 
(SELECT DISTINCT listingId, locationId 
FROM l_f_locations 
WHERE locationId IN (7, 9, 10)) AS foo 
GROUP by listingId, HAVING num = 3 

我第一次嘗試創建子查詢，因爲它是一個完整的MySQL查詢，但後來卻沒把它融入主要查詢。我無法將子查詢別名「AS foo」，因爲這是完成SQL squery工作的要求。

任何想法？

Answer 1

首先，你可以做到這一點沒有一個子查詢：

SELECT listingId, COUNT(DISTINCT locationId) AS num 
FROM l_f_locations 
WHERE listingId IN(7,9,10) 
GROUP BY listingId 
HAVING num = 3; 

對於未來的參考，但是，你可以做你提到使用一對Zend_Db_Select對象的對象，一個子查詢查詢和另一個爲主：

$subQuery = $dbAdapter->select() 
    ->from('l_f_locations', array('listingId', 'locationId')) 
    ->where('locationId IN(7,9,10)') 
    ->group('listingId') 
    ->group('locationId'); 

$select = $dbAdapter->select() 
    ->from($subQuery, array('*', 'num' => 'COUNT(*)')) 
    ->group('listingId') 
    ->having('num = 3'); 

$result = $select->query()->fetchAll();