子查询错误

Question

我无法在下面的 sql 子查询中找到错误。我想要 PublisherWise ImgCount 作为我的输出。请指导我哪里做错了。 TIA.

SELECT pubinfo.mf_pu_id,pubinfo.mf_pu_name, lang.mf_li_name, COUNT(innQ1.mf_cr_fileid) AS Imgcount 
FROM  mf_publication_info AS pubinfo 
LEFT JOIN 
    (SELECT mf_cr_fileid,mf_cr_masid,mf_cr_pubid, innQ.`mf_mi_publisheddate`                                          
     FROM mf_compare_results  
     WHERE mf_cr_enginedecision='p'AND mf_cr_userdecision IN('M',' M',' EM','EM')
     INNER JOIN 
         (SELECT mf_mi_id,mf_mi_publisheddate 
          FROM mf_media_info  
          WHERE mf_mi_publisheddate BETWEEN '2015-07-27' AND 
              '2015-07-31' AND `mf_mi_processid`=16
         ) AS innQ
     ) AS innQ1  
      ON innQ1.mf_cr_fileid=innQ.mf_mi_id
      ON pubinfo.mf_pu_id=innQ1.mf_cr_pubid
      INNER JOIN mf_language_info lang
          ON pubinfo.mf_pu_langid = lang.mf_li_id
          GROUP BY pubinfo.mf_pu_name ORDER BY pubinfo.mf_pu_name

Answer 1

这里有以下两种解读，（我认为），如有错误请指正

示例 1：

SELECT x
FROM table 1
    LEFT JOIN (sub 1) alias ON x=x
    INNER JOIN (sub 2) alias ON x=x
    INNER JOIN table 2 ON x=x
GROUP BY x
ORDER BY x

示例 2：

SELECT x
FROM table 1
    LEFT JOIN (
        (sub 1) alias
        INNER JOIN
        (sub 2) alias ON x=x
    ) alias ON x=x
    INNER JOIN table 2 ON x=x
GROUP BY x
ORDER BY x

如果是第二个（这对我来说很有意义），那么您需要为第一个子查询设置一个别名，并在第一个左连接处使用一个左括号，并为第一个内部连接子查询设置 ON 标准。

请写下，因为我有一个非常简化的版本，你想写的东西，这样应该更有意义。

子查询错误

sub queries error

mysql

sql

subquery