[英]Getting Min and Max based on calculated values in a table
我正在從我創建的臨時表#t1中選擇一些行:
SELECT FutContract,
Quantity,
Date,
Price,
TotalQuantity,
PercentOfTotalQ,
CumulativePercentile=
(SELECT ROUND(SUM(PercentOfTotalVol),2) FROM #t1 b
WHERE b.OvernightVol <= a.OvernightVol AND b.FutContract = a.FutContract)
FROM #t1 a
我想創建另外兩行代表MIN(Price)和MAX(Price),其中CumulativePercentile大於0.3(第30百分位數),但我能想到的唯一方法是創建另一個臨時表。 如果可能的話,我寧願不要這樣做。 有任何想法嗎?
編輯:
;WITH z AS
(SELECT FutContract, OvernightVol, MorningDate, Price, TotalVol,
PercentOfTotalVol, CumulativePercentile=
(SELECT ROUND(SUM(PercentOfTotalVol),2) FROM #t1 b
WHERE b.OvernightVol <= a.OvernightVol AND b.FutContract = a.FutContract) FROM #t1 a)
SELECT *,
(SELECT MIN(Price) OVER(PARTITION BY FutContract) FROM z WHERE CumulativePercentile > 0.3) AS min70px,
(SELECT MAX(Price) OVER(PARTITION BY FutContract) FROM z WHERE CumulativePercentile > 0.3) AS max70px
FROM z
如果您使用的是SQL Server 2005或更高版本,則CTE
應該會有所幫助
;with z as
(SELECT FutContract,
Quantity,
Date,
Price,
TotalQuantity,
PercentOfTotalQ,
CumulativePercentile=
(SELECT ROUND(SUM(PercentOfTotalVol),2) FROM #t1 b
WHERE b.OvernightVol <= a.OvernightVol AND b.FutContract = a.FutContract)
FROM #t1 a
)
select
(select min(price) from z Z1 where Z1.CumulativePercentile > 0.3 and Z1.FutContract = z.FutContract) min_price,
(select max(price) from z Z1 where Z1.CumulativePercentile > 0.3 and Z1.FutContract = z.FutContract) max_price,
*
from z
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