我可以在Case Statement中使用「AS」關鍵字

Question

我想創建一個視圖，其中包含兩個新列作爲SC和NC。

我想寫一個比較country1和Supplier Country的邏輯，如果匹配那麼我想要MOQ進行比較。如果匹配，那麼我希望將相應起訂量的成本作爲NC存儲在視圖中，SC

這是否適合做這件事。最多有3個國家，5個Moq，3個供應商國家，3個供應商MOQ。

create view viewCountry as 
select dbo.SCN_Vw_ProjectDetailsReport_Revision.*,'' as SC, '' as NC, 
case 
when 
country1=supplier_country1 
then 
(
case 
when 
lot_size=negotiated_lot_size then lot_size1_1 as SC, Negotiated_cost as NC 
when 
moq2=negotiated_lot_size then lot_size2_1 as SC, Negotiated_cost as NC 
when 
moq3=negotiated_lot_size then lot_size5_1 as SC, Negotiated_cost as NC 
when 
moq4=negotiated_lot_size then lot_size10_1 as SC, Negotiated_cost as NC 
when 
moq5=negotiated_lot_size then lot_size25_1 as SC, Negotiated_cost as NC 
else NULL as SC, NULL as NC 
) end as SC,NC 
when 
country1=supplier_country2 
then 
(
case 
when 
lot_size=negotiated_lot_size2 then lot_size1_1 as SC, Negotiated_cost2 as NC 
when 
moq2=negotiated_lot_size2 then lot_size2_1 as SC, Negotiated_cost2 as NC 
when 
moq3=negotiated_lot_size2 then lot_size5_1 as SC, Negotiated_cost2 as NC 
when 
moq4=negotiated_lot_size2 then lot_size10_1 as SC, Negotiated_cost2 as NC 
when 
moq5=negotiated_lot_size2 then lot_size25_1 as SC, Negotiated_cost2 as NC 
else NULL as SC, NULL as NC 
) 
when 
country3=supplier_country3 
then 
(
case 
when 
lot_size=negotiated_lot_size3 then lot_size1_1 as SC, Negotiated_cost3 as NC 
when 
moq2=negotiated_lot_size3 then lot_size2_1 as SC, Negotiated_cost3 as NC 
when 
moq3=negotiated_lot_size3 then lot_size5_1 as SC, Negotiated_cost3 as NC 
when 
moq4=negotiated_lot_size3 then lot_size10_1 as SC, Negotiated_cost3 as NC 
when 
moq5=negotiated_lot_size3 then lot_size25_1 as SC, Negotiated_cost3 as NC 
else NULL as SC, NULL as NC 
) 
from SCN_Vw_ProjectDetailsReport_Revision 

Answer 1

ü不能做到這一點，U只能在「終結」語句CASE結束設置您的列名，下面是可以通過您所提供的信息創建我最好的樣本。

你不能這樣做，你只能在CASE的'End'語句末尾設置你的列名，下面是我可以通過提供的信息創建的最好的示例。

create view viewCountry as 
select dbo.SCN_Vw_ProjectDetailsReport_Revision.*,'' as SC, '' as NC, 
    from SCN_Vw_ProjectDetailsReport_Revision 
    UNION ALL 

select dbo.SCN_Vw_ProjectDetailsReport_Revision.*, 
case 
when 
country1=supplier_country1 
then 
(
case 
when 
lot_size=negotiated_lot_size then lot_size1_1 
when 
moq2=negotiated_lot_size then lot_size2_1 
when 
moq3=negotiated_lot_size then lot_size5_1 
when 
moq4=negotiated_lot_size then lot_size10_1 
when 
moq5=negotiated_lot_size then lot_size25_1 
else NULL END 
) END 'SC', 
case 
when 
country1=supplier_country1 
then 
(
case 
when 
lot_size=negotiated_lot_size then Negotiated_cost 
when 
moq2=negotiated_lot_size then Negotiated_cost 
when 
moq3=negotiated_lot_size then Negotiated_cost 
when 
moq4=negotiated_lot_size then Negotiated_cost 
when 
moq5=negotiated_lot_size then Negotiated_cost 
else NULL END 
) END 'NC' 


    from SCN_Vw_ProjectDetailsReport_Revision 
    UNION ALL 

     select dbo.SCN_Vw_ProjectDetailsReport_Revision.*, 
    ,  
CASE 
when 
country1=supplier_country2 
then 
(
case 
when 
lot_size=negotiated_lot_size2 then lot_size1_1 
when 
moq2=negotiated_lot_size2 then lot_size2_1 
when 
moq3=negotiated_lot_size2 then lot_size5_1 
when 
moq4=negotiated_lot_size2 then lot_size10_1 
when 
moq5=negotiated_lot_size2 then lot_size25_1 
else NULL END 
) END 'SC' 
, 

CASE 
when 
country1=supplier_country2 
then 
(
case 
when 
lot_size=negotiated_lot_size2 then Negotiated_cost2 
when 
moq2=negotiated_lot_size2 then Negotiated_cost2 
when 
moq3=negotiated_lot_size2 then Negotiated_cost2 
when 
moq4=negotiated_lot_size2 then Negotiated_cost2 
when 
moq5=negotiated_lot_size2 then Negotiated_cost2 
else NULL END 
) END 'NC' 


    from SCN_Vw_ProjectDetailsReport_Revision 
    UNION ALL 

     select dbo.SCN_Vw_ProjectDetailsReport_Revision.*, 
    CASE 
when 
country3=supplier_country3 
then 
(
case 
when 
lot_size=negotiated_lot_size3 then lot_size1_1 
when 
moq2=negotiated_lot_size3 then lot_size2_1 
when 
moq3=negotiated_lot_size3 then lot_size5_1 
when 
moq4=negotiated_lot_size3 then lot_size10_1 
when 
moq5=negotiated_lot_size3 then lot_size25_1 
else NULL END 
) END 'SC' 
, 

CASE 
when 
country3=supplier_country3 
then 
(
case 
when 
lot_size=negotiated_lot_size3 then Negotiated_cost3 
when 
moq2=negotiated_lot_size3 then Negotiated_cost3 
when 
moq3=negotiated_lot_size3 then Negotiated_cost3 
when 
moq4=negotiated_lot_size3 then Negotiated_cost3 
when 
moq5=negotiated_lot_size3 then Negotiated_cost3 
else NULL END 
) END 'NC' 


    from SCN_Vw_ProjectDetailsReport_Revision