正确连接将第4个表添加到查询中

Question

问了一个类似的问题HERE，但这延伸了它。

这是原始查询：

SELECT  p.pid
    , p.title
    , p.description
    , p.price
    , p.datecreated AS pdate
    , p.image1
    , c.cid
    , c.comment
    , c.datecreated AS cdate
    , pa.fname AS PFName
    , pa.lname AS PLName
    , ca.fname AS CFName
    , ca.lname AS CLName
FROM tblPosts p
LEFT JOIN tblUsers pa ON pa.uid = p.uid
LEFT JOIN tblComments c ON p.pid = c.pid
LEFT JOIN tblUsers ca ON ca.uid = c.uid
ORDER BY p.pid

我需要添加第四个表（tblPostStatus）来保存每个帖子的状态（statusType），它可以是两个不同的值之一。当我尝试添加JOIN时，我似乎得到了duped行，tblPostStatus中每行一个（此表中有3条记录）。该表包含字段sid，pid，uid，statusType。

新查询：

    SELECT  p.pid
    , p.title
    , p.description
    , p.price
    , p.datecreated AS pdate
    , p.image1
    , c.cid
    , c.comment
    , c.datecreated AS cdate
    , pa.fname AS PFName
    , pa.lname AS PLName
    , ca.fname AS CFName
    , ca.lname AS CLName
    , ps.statusType
FROM tblPosts p
LEFT JOIN tblUsers pa ON pa.uid = p.uid
LEFT JOIN tblComments c ON p.pid = c.pid
LEFT JOIN tblUsers ca ON ca.uid = c.uid
LEFT JOIN tblPostStatus ps ON p.pid = ps.pid
ORDER BY p.pid

查看查询结果图片：

这些结果看起来是否合适，或者我做错了什么？

Answer 1

（聊天摘要）

整体要求有所改变。最终，“状态”与帖子，用户和评论记录相关，因此状态已移至评论表。增加了一项额外要求：确定具有“索赔”评论的帖子。

SQL Fiddle

SELECT  p.pid
    , p.title
    , c.cid
    , c.comment
    , c.statusType 
    , COALESCE(cnt.HasClaim, 0) AS HasClaim
    , pa.fname AS PFName
    , pa.lname AS PLName
    , ca.fname AS CFName
    , ca.lname AS CLName
FROM tblPosts p
      LEFT JOIN tblUsers pa ON pa.uid = p.uid
      LEFT JOIN tblComments c ON p.pid = c.pid
      LEFT JOIN tblUsers ca ON ca.uid = c.uid
      LEFT JOIN (
          SELECT pid, COUNT(*) AS HasClaim
          FROM  tblComments 
          WHERE statusType = 1
          GROUP BY pid
        ) cnt ON cnt.pid = p.pid
ORDER BY p.pid, c.cid