SQL-汇总案例/何时来自不同字段的值 [英] SQL- Summing Case/When values from different fields

问题描述

我正在尝试对从 CASE/WHEN 语句生成的值求和.唯一的问题是这些值来自不同的字段.

I am trying to SUM values generated from a CASE/WHEN statement. The only problem is that the values come from different fields.

示例:

这是我的查询中许多项中的一组开销值.在此示例中，我需要将开销值 14.850000 和 1.166600 相加到 16.016.
vac_type 列确定成本的类型.在这种情况下，当 vac_type = WO1 或 WO2 时，它们是间接成本.W10 不是，因此是 NULL 值.

Example:

This is a set of overhead values from one item out of many in my query. In this example, I need to SUM the overhead values 14.850000 and 1.166600 to 16.016.
The vac_type column determines the type of costs. In this case, when vac_type = WO1 or WO2, they are overhead costs. W10 is not, thus the NULL value.

总共有 12 个 vac_types 是开销值.它们都列在我的 CASE/WHEN 语句中.我需要按 item_no 对所有这些开销值求和，但由于 vac_type 字段有两个不同的值，我的查询认为它们彼此不同，无法求和.

In all, there are 12 vac_types that are overhead values. They are all listed in my CASE/WHEN statement. I need to SUM all of these overhead values by item_no, but since the vac_type field has two different values, my query considers them DISTINCT from each other and unable to be summed.

这是我尝试通过 item_no 对开销求和的失败尝试.它生成上面截图来自的列表:

This is my unsuccessful attempt to SUM Overhead by item_no. It generates the list in which the screenshot above comes from:

SELECT DISTINCT 'Overhead' =  SUM(CASE
                          WHEN vac_type IN('A01', 'AD0', 'ADX', 'A01', 'CI0', 'DO1', 'DP9',
                          'O20', 'PWO', 'TO1', 'WO1', 'WO2')
                     THEN (Cost_Values)
                     ELSE NULL
                     END,
         item_no,
         comp_item,
         vac_type

FROM     table_1

GROUP BY item_no,
         comp_item,
         vac_type

推荐答案

感谢@Lamak 的回答.为了按 item_no 求和开销，需要从 SELECT 和 GROUP BY 语句中删除任何唯一字段.通过删除 vac_type，我得到了我需要的数据.

Thank you to @Lamak for answering. In order to SUM overhead by item_no, any unique fields need to be removed from the SELECT and GROUP BY statement. By removing vac_type, I got the data I needed.

SELECT 'Overhead' = Sum(CASE
                      WHEN vac_type IN ( 'A01', 'AD0', 'ADX', 'AO1',
                                                      'CI0', 'DO1', 'DP9', 'O20',
                                                      'PWO', 'TO1', 'WO1', 'WO2' ) 
                    THEN (Cost_Values)
                      ELSE NULL
                    END),

   item_no,
   comp_item_no
FROM     table_1

GROUP BY item_no,
     comp_item

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