SQL Server：跨多個colums的支點

Question

我有一個嚴重的問題。說我的數據被安排在此格式：

Name  Businees_unit Forecast Upside 
Jack.N India   100  50 
Jack.N China   250  20 

我必須轉動Forecast和Upside爲Business_Unit使表看起來就像這樣

Name Forecast_India Upside_India  Forecast_China Upside_China 
Jack 100    50    250    20 

這可以在一個查詢做什麼？

它是我的第一個入口，所以任何幫助都非常受歡迎。

感謝

Answer 1

一個通用的解決方案：

select name, 
     sum(case when Businees_unit = 'India' then Forecast else 0 end) Forecast_India, 
     sum(case when Businees_unit = 'India' then Upside else 0 end) Upside_India, 
     sum(case when Businees_unit = 'China' then Forecast else 0 end) Forecast_China, 
     sum(case when Businees_unit = 'China' then Upside else 0 end) Upside_China 
from My_table 
group by name 

Answer 2

我會使用自聯接：

SELECT DISTINCT SomeTable.Name, China.Forecast as Forecast_China, China.Upside as Upside_China 
, India.Forecast as Forecast_India, India.Upside as Upside_India 
FROM SomeTable 
inner join SomeTable India on India.Name = SomeTable.Name AND India.Business_unit = 'India' 
inner join SomeTable China on China.Name = SomeTable.Name AND China.Business_unit = 'China'