'合并'2个mysql查询

Question

我有2个查询，我想将其变成一个。

第一

        SELECT 
        poll_questions.id,
        poll_questions.question,
        poll_questions.qmore,
        poll_questions.total_votes,
        poll_questions.active,
        poll_questions.created_at,
        poll_answers.answer,
        poll_answers.votes,
        poll_answers.id AS answer_id,
        poll_photos.photo_name_a,
        users.username

        FROM poll_questions 

        LEFT JOIN (poll_answers, poll_photos)  
            ON (poll_answers.question_id = poll_questions.id AND
                poll_photos.question_id = poll_questions.id
                )
        LEFT JOIN users ON poll_questions.author = users.id 

        WHERE poll_questions.active = 1 

        ORDER BY poll_questions.created_at DESC 

        LIMIT {$per_page} OFFSET {$offset}

第二

SELECT vote_history_raw.vote
FROM vote_history_raw
WHERE vote_history_raw.user_id = {$user_id}

请注意，第一个查询中的用户是作者，第二个查询中的用户是选民。

感谢您的帮助！