How to use union in zend db

Question

In sql i am using union i don\'t know how to write it in zend db.

select m.*, 0 as is_shared from test m where user_id = $userId 
union
select m.*,1 as is_sh         


        

Answer 1

I don't know our sql is work. But it can make following code.

$userId = 10;
$email = 'bbsdf@sdf.sd';

$select1 = $db->select()
                ->from(array('m' => 'test'), array('*', '0 AS is_shared'))
                ->where('user_id =?', $userId);

$select2 = $db->select()
                ->from(array('m' => 'test'), array('*', '1 AS is_shared'))
                ->join(array('ms' => 'test_shares'), 'm.test_id = ms.test_id', '')
                ->where('ms.email_address =?', $email)
                ->where('m.url IS NULL');                  

$select = $this->select()
     ->union(array($select1, $select2))
     ->order('title');

echo $select; die;

        /*SELECT `m`.*, `m`.`0` AS `is_shared` 
         * FROM `test` AS `m` 
         * WHERE (user_id =10) 
         * UNION 
         * SELECT `m`.*, `m`.`1` AS `is_shared` 
         * FROM `test` AS `m` 
         * INNER JOIN `test_shares` AS `ms` 
         * ON m.test_id = ms.test_id 
         * WHERE (ms.email_address ='bbsdf@sdf.sd') AND (m.url IS NULL) 
         * ORDER BY `title` ASC*/