加入和计算问题

Question

好吧，经过3-4天试图解决这个问题，我放弃了。 我开始时只有一张桌子，但现在我已经改变了很多，所以我能够有两张桌子，我认为这会让像我这样的菜鸟更容易。 See my earlier post here

取而代之发布的所有表的细节在这里我提供一个截图： Tables and expected result

我已设法取得相当大的本，但问题是，我无法做到不包括计算不应包含的批次。

我该如何解决这个问题？我非常感谢我从你们那里得到的帮助。 在此先感谢

Answer 1

第一步：获取详细信息表创建一个过滤器

SELECT 
    MAX(id) AS id 
FROM details 
GROUP BY `concat`, `batch` 

下一步：使用该查询详细信息表

SELECT * FROM details 
WHERE id IN (
    SELECT 
     MAX(id) AS id 
    FROM details 
    GROUP BY `concat`, `batch` 
) 

下一步：使用此派生表加入主表为您的最终结果

SELECT 
    `master`.id AS id, 
    `master`.plant AS plant, 
    `master`.`code` AS `code`, 
    COUNT(*) AS distinct_batches, 
    SUM(filtereddetails.volume) AS total_vol, 
    SUM(filtereddetails.`value`) AS total_val, 
    SUM(filtereddetails.volume*filtereddetails.risk) AS risk_vol, 
    SUM(filtereddetails.`value`*filtereddetails.risk) AS risk_val, 
    MAX(filtereddetails.end_date-filtereddetails.start_date) AS max_date_diff 
FROM 
    `master` 
    INNER JOIN (
    SELECT * FROM details 
    WHERE id IN (
     SELECT 
      MAX(id) AS id 
     FROM details 
     GROUP BY `concat`, `batch` 
    ) 
) AS filtereddetails ON `master`.`concat`=filtereddetails.`concat` 
GROUP BY 
    `master`.`concat`