zend_db_select:使用join

我有这个问题:

SELECT
    groups.name
    categories.name,
    categories.label
FROM
    groups
JOIN
    categories
ON
    (categories.group1 = groups.id
OR
    categories.group2 = groups.id)
AND
    groups.label = :section
AND
    categories.active = 1

现在,这是我使用zend_db_select进行的连接,但它给了我数组错误。

$select->from($dao, array('groups.name', 'categories.name', 'categories.label'))
       ->join(array('categories', 'categories.group1 = groups.id OR categories.group2 = groups.id'))
       ->where('groups.label = ?', $group)
       ->where('categories.active = 1');

我的错误:

异常信息:

消息:select查询无法与联接 另一张桌子

有人知道我做错了什么吗?

更新/解决方案:

我找到了解决办法。我只是在这里张贴解决方案,以防其他人陷入这样的问题。解决方案是:

$db = Zend_Registry::get('db');
$dao = new Default_Model_Db_CategoryDao('db');
$select = $dao->select();

$select->setIntegrityCheck(false)
       ->from(array('c' => 'categories'), array('name', 'label'))
       ->join(array('g' => 'groups'), 'c.group1 = g.id OR c.group2 = g.id', 'g.label')
       ->where('g.label = ?', $group)
       ->where('c.active = 1');

return $dao->fetchAll($select);