如何在 Select SQL 中嵌套大小写？答案

【问题标题】：How to Nested Case in Select SQL?如何在 Select SQL 中嵌套大小写？
【发布时间】：2010-09-10 06:45:26
【问题描述】：

我有这个 select Case SQL 语句，它计算给定数量的总体积。

SELECT
DropshipPackinglist.CaseNumber as 'CASE NO.',  
DropshipPackinglist.ItemNumber as 'BOM NO.', 
DropshipPackinglist.Quantity as 'QTY',
                      CASE 
                      WHEN DropshipPackinglist.Quantity >=31 and DropshipPackinglist.Quantity <= 36 then '1090x730x1460'
                      WHEN DropshipPackinglist.Quantity >=25 and DropshipPackinglist.Quantity <= 30  then '1090x730x1230'
                      WHEN DropshipPackinglist.Quantity >=19 and DropshipPackinglist.Quantity <= 24  then '1090x730x1000'
                      WHEN DropshipPackinglist.Quantity >=13 and DropshipPackinglist.Quantity <= 18  then '1090x720x790'
                      WHEN DropshipPackinglist.Quantity >=7 and DropshipPackinglist.Quantity <= 17  then '1090x720x570'
                      WHEN DropshipPackinglist.Quantity >=1 and DropshipPackinglist.Quantity <= 6  then '1090x720x350'

                      ELSE 'Unkown' 
                      end
                      as 'TOTAL VOLUME (MM3)'                                      

FROM         DropshipPackinglist INNER JOIN
                      HuaweiDescription ON DropshipPackinglist.ItemNumber = HuaweiDescription.ItemNumber

WHERE     (DropshipPackinglist.BatchCode LIKE '%0005041007100AHWA11HG')

-------------------------------------------------------------------------------------------
Result:

CaseNumber ItemNumber      Quantity  TotalVolume
1     52411573  5   1090x720x350
1     52411576  20  1090x730x1000
2     52411576  36  1090x730x1460

-------------------------------------------------------------------------------------------

现在，我想将 casenumber 和 result 分组为一个总卷。

结果就是这个。

CaseNumber ItemNumber      Quantity  TotalVolume
1     52411573  5   1090x730x1230  -- sum(casenumber 1)=25
1     52411576  20  1090x730x1230  --
2     52411576  36  1090x730x1460

如何解决这个问题..谢谢。

【问题讨论】：

标签： c# sql mysql sql-server

【解决方案1】：

;with SuperSelect as 
(
 SELECT  dpl.CaseNumber as 'CASE NO.'
     ,dpl.ItemNumber as 'BOM NO.'
     ,dpl.Quantity as 'QTY'
     ,CASE WHEN dpl.Quantity >= 31 and dpl.Quantity <= 36 then '1090x730x1460'
     WHEN dpl.Quantity >= 25 and dpl.Quantity <= 30 then '1090x730x1230'
     WHEN dpl.Quantity >= 19 and dpl.Quantity <= 24 then '1090x730x1000'
     WHEN dpl.Quantity >= 13 and dpl.Quantity <= 18 then '1090x720x790'
     WHEN dpl.Quantity >= 7 and dpl.Quantity <= 17 then '1090x720x570'
     WHEN dpl.Quantity >= 1 and dpl.Quantity <= 6 then '1090x720x350'
     ELSE 'Unkown'
   end as 'TOTAL VOLUME (MM3)'
 FROM    DropshipPackinglist dpl
 INNER JOIN HuaweiDescription hd ON dpl.ItemNumber = hd.ItemNumber
 WHERE   (dpl.BatchCode LIKE '%0005041007100AHWA11HG')
)
select *, sum([QTY]) over (partition by ss.[CASE NO.]) [TotalVolume]
from SuperSelect ss

【讨论】：

操作数数据类型 varchar 对 sum 运算符无效。
我在哪里可以在[Total Volume]的结果中添加case语句

【解决方案2】：

如果每个 caseNumber 只需要一行，则使用

SELECT CaseNumber, Quantity, SUM(ItemNumber) TotalVolume 
FROM (...YourOriginalQuery...)
GROUP BY CaseNumber, Quantity

如果您需要所有行但还想报告每个案例编号的总计，请使用以下查询：

SELECT CaseNumber, ItemNumber, Quantity,
                 SUM(ItemNumber) OVER(PARTITION BY CaseNumber) TotalVolume
    FROM   (SELECT DropshipPackinglist.CaseNumber, DropshipPackinglist.ItemNumber,
                                    DropshipPackinglist.Quantity,
                                    CASE
                                         WHEN DropshipPackinglist.Quantity >= 31
                                                    AND DropshipPackinglist.Quantity <= 36 THEN
                                            '1090x730x1460'
                                         WHEN DropshipPackinglist.Quantity >= 25
                                                    AND DropshipPackinglist.Quantity <= 30 THEN
                                            '1090x730x1230'
                                         WHEN DropshipPackinglist.Quantity >= 19
                                                    AND DropshipPackinglist.Quantity <= 24 THEN
                                            '1090x730x1000'
                                         WHEN DropshipPackinglist.Quantity >= 13
                                                    AND DropshipPackinglist.Quantity <= 18 THEN
                                            '1090x720x790'
                                         WHEN DropshipPackinglist.Quantity >= 7
                                                    AND DropshipPackinglist.Quantity <= 17 THEN
                                            '1090x720x570'
                                         WHEN DropshipPackinglist.Quantity >= 1
                                                    AND DropshipPackinglist.Quantity <= 6 THEN
                                            '1090x720x350'
                                         ELSE
                                            'Unkown'
                                    END AS 'TOTAL VOLUME (MM3)'
                     FROM   DropshipPackinglist
                     INNER  JOIN HuaweiDescription
                     ON     DropshipPackinglist.ItemNumber = HuaweiDescription.ItemNumber
                     WHERE  (DropshipPackinglist.BatchCode LIKE '%0005041007100AHWA11HG'))

【讨论】：