Question

我正在尝试在ZF 2中运行特殊的SQL查询。

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

我首先尝试创建子查询，因为它是一个完整的MySQL查询，但是根本无法将其集成到主查询中。我不能为子查询添加别名，例如“AS foo”因为这是完整SQL squery工作的要求。

有什么想法吗？

Answer 1

首先，您可以在没有子查询的情况下执行此操作：

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

但是，为了将来参考，您可以使用一对Zend_Db_Select对象执行查询，一个用于子查询，另一个用于主查询：

$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();

Zend Framework 2 - sql子查询

1 个答案: