sqlite - 如何在group_concat中使用sum和joins

Question

我有两个表，CustomerCategories和Articles。这两个表都有一个称为VatPercentage和VatPrice的列。

场景：


如果两个表中存在相同的增值税百分比，我想对两个表中的增值税价格求和并将其添加到字符串中。
如果增值税百分比仅存在于CustomerCategories表中，我想从此处汇总增值税价格并将其添加到字符串中。
如果增值税百分比仅存在于“商品”表中，则我想从此处汇总增值税价格并将其添加到字符串中。


表格示例：

文章：

ArticleId       TotalPrice      VatPercentage    VatPrice
1                   100         25.0000000000    25
2                   80          25.0000000000    20
3                   50          8.0000000000     4
4                   70          8.0000000000     5.6
5                   20          0                0
6                   0           0                0

客户类别：

CustomerCategoryId  TotalPrice  VatPercentage   VatPrice
2                   163         8.0000000000    13
2                   163         13.0000000000   13
2                   163         0               0
2                   150         25.0000000000   37.5

在这种情况下，我想从查询中返回结果：

{esc}{40h}25 %{esc}{41h}82.5 NOK{lf}{esc}{40h}8 %{esc}{41h}22.6 NOK{lf}{esc}{40h}13 %{esc}{41h}13 NOK{lf}

我尝试没有任何积极结果的代码是：

SELECT GROUP_CONCAT(Result, '|') Results
FROM (
   select case when cc.VatPercentage = a.VatPercentage 
   then
   SELECT '{esc}{40}' || CAST(cc.VatPercentage AS INTEGER) || '% ' ||
           (SUM(cc.VatPrice) + SUM(a.VatPrice)) || ' NOK' || '{lf}' Result    end
else
   (
     case when cc.VatPercentage <> a.VatPercentage
       then 
       SELECT '{esc}{40}' || CAST(cc.VatPercentage AS INTEGER) || '% ' ||
           (SUM(cc.VatPrice) + SUM(a.VatPrice)) || ' NOK' || '{lf}' ||
           SELECT '{esc}{40}' || CAST(a.VatPercentage AS INTEGER) || '% ' ||
           (SUM(a.VatPrice)) || ' NOK' || '{lf}' Result 
      end
   )
FROM CustomerCategories cc
LEFT JOIN Articles a
  on cc.VatPercentage = a.VatPercentage
WHERE 
  cc.VatPercentage != '0' 
  AND a.VatPercentage != '0'
  AND cc.TotalPrice != '0'
  AND a.TotalPrice != '0'
  GROUP BY 
    cc.VatPercentage OR a.VatPercentage) x

帮助将不胜感激。

Fiddle

Answer 1

首先，combine两个表：

SELECT VatPercentage, VatPrice FROM CustomerCategories
UNION ALL
SELECT VatPercentage, VatPrice FROM Articles

VatPercentage   VatPrice8.0000000000    1313.0000000000   130               025.0000000000   37.525.0000000000   2525.0000000000   208.0000000000    48.0000000000    5.60               00               0

Then do a simple GROUP BY over that:

SELECT VatPercentage,
       SUM(VatPrice) AS PriceSum
FROM (SELECT VatPercentage, VatPrice FROM CustomerCategories
      UNION ALL
      SELECT VatPercentage, VatPrice FROM Articles)
WHERE VatPercentage != '0'
GROUP BY VatPercentage

然后将转义符弄乱结果：

SELECT GROUP_CONCAT('{esc}{40h}' || VatPercentage || ' %' ||
                    '{esc}{41h}' || VatPrice      || ' NOK{lf}',
                    '')
FROM (SELECT VatPercentage,
             SUM(VatPrice) AS PriceSum
      FROM (SELECT VatPercentage, VatPrice FROM CustomerCategories
            UNION ALL
            SELECT VatPercentage, VatPrice FROM Articles)
      WHERE VatPercentage != '0'
      GROUP BY VatPercentage)