选择（MySQL的）

Question

表1

id | question 
1 | who will win the election 

表2

id | answers | question id 
1 | I will | 1 

表3

id | photo | question id 
1 | xy.gif| 1 

表4 *用户可以既建议问题，并投给他人

id | username 
1 | joe 

表5

id | vote | question_id | user_id 
1 | He | 1   | 1 

是什么会让我下面的信息在一个查询

• T1查询。*（所有的问题）
• T2所有的答案连接到问题
• t3与问题相关的所有照片
• t4每个问题的作者用户名

• T5的问题选票（这是可能的，一些问题会不会有表决的登录用户）

• 我的问题是最后一点，得到了选票（虽然不是所有的问题都投票通过具体登录的用户）

这里是我的查询看起来像：

  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, 
     vote_history_raw.vote, 
     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 

     INNER JOIN vote_history_raw ON users.id = vote_history_raw.user_id 

     WHERE poll_questions.active = 1 

     ORDER BY poll_questions.created_at DESC 

谢谢了！

Answer 1

没有尝试过，但是这样做的工作？

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, 
    vote_history_raw.vote, 
    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 

    LEFT JOIN vote_history_raw ON (users.id = vote_history_raw.user_id OR users.id <> vote_history_raw.user_id AND vote_history_raw.user_id IS NOT NULL) 

    WHERE poll_questions.active = 1 

    ORDER BY poll_questions.created_at DESC