連接數據透視表，重命名列。 SQL

Question

我有下面的查詢，它從包含日期，貨幣，mvcleanccy和spotsek的表中進行選擇。

問題1.如何重命名列從DKK，EUR ...到DKK_MV，EUR_MV。

問題2我有和'MV_SEK' = mvcleanccy*spotsek被MV = mvcleanccy替換的唯一不同之處。 如果我想在查詢中的位置日期中加入這兩個樞紐，那麼如何在不創建兩個獨立表並在事後加入的情況下做到這一點？

SELECT * 
FROM(
SELECT 
    currency 
    ,'MV_SEK' = mvcleanccy*spotsek 
    ,todaypositiondate 
from T1 
) as src 
PIVOT 
(
sum(MV_SEK) 
for 
currency in ([DKK], [EUR], [NOK], [SEK], [USD]) 
) 
as pivottable 
Order by todaypositiondate desc 

Answer 1

SELECT currency, [DKK] as [DKK_MV], [EUR] as [EUR_MV], [NOK] as [NOK_MV], [SEK] as [SEK_MV], [USD] as [USD_MV] -- this should rename the columns as per question 1 

FROM(
SELECT 
    currency 
    ,'MV_SEK' = mvcleanccy*spotsek 
    ,todaypositiondate 
from T1 
) as src 
PIVOT 
(
sum(MV_SEK) 
for 
currency in ([DKK], [EUR], [NOK], [SEK], [USD]) 
) 
as pivottable 
Order by todaypositiondate desc 

Answer 2

我認爲您的解決方案將符合條件的聚集簡單：

select todaypositiondate, 
     sum(case when currency = 'DKK' then mvcleanccy * spotsek end) as dkk_mv, 
     sum(case when currency = 'EUR' then mvcleanccy * spotsek end) as eur_mv, 
     . . . 
     sum(case when currency = 'DKK' then mvcleanccy end) as dkk, 
     sum(case when currency = 'EUR' then mvcleanccy end) as eur, 
     . . . 
from t1 
group by todaypositiondate 
order by todaypositiondate;