逆透視數據與多列 - 語法幫助請

Question

我有，我想UNPIVOT

我創造了這個查詢UNPIVOT的「實際」行，但似乎無法以下數據找出未計劃'計劃'和'優先'的語法。

SELECT FiscalYear, Period, MetricName, ActualValue 
FROM vw_ExecSummary 
UNPIVOT 
(ActualValue FOR MetricName IN ([Net Revenue], [Total C.S. Salaries] 
)) AS unpvt 
WHERE [Type] = 'Actual' 

逆轉置數據看起來是這樣，但我想還計劃和PriorYear列添加到ActualValue欄的右側下方

任何幫助將不勝感激。謝謝。

Answer 1

我目前無法測試此功能，但我認爲它可以像這樣工作。首先，你需要UNPIVOT所有數據：

SELECT fiscalYear, period, type, metricName, metricValue 
FROM vw_ExecSummary 
UNPIVOT (metricValue FOR metricName IN ([Net Revenue], [Total C.S. Salaries])) unpvt 

應該產生看起來是這樣的一個表，該表：

fiscalYear period type  metricName    metricValue 
=================================================================== 
15   1  'Actual' 'Net Revenue'   3676798.98999997 
15   1  'Actual' 'Total C.S. Salaries' 1463044.72 
15   1  'Plan' 'Net Revenue'   3503920.077405 
...................... (remaining rows omitted) 

然後我們可以PIVOT行正常，以獲得新的列（這就是它的用途）：

SELECT fiscalYear, period, metricName, 
     [Actual] AS actualValue, [Plan] AS planValue, [PriorYear] AS priorYearValue 
FROM <previous_data> 
PIVOT (SUM(metricValue) FOR (type IN ([Actual], [Plan], [PriorYear]) pvt 

（SUM(...)實際上不應該做一個ything這裏，作爲推測其他列包含唯一行，但我們需要使用聚合函數）

...這應該產生一個類似於如下：

fiscalYear period metricName  actualValue  planValue  priorYearValue 
====================================================================================== 
15   1  'Net Revenue' 3676798.98999997 3503920.077405 40436344.4499999 
...................................... (remaining rows omitted) 

所以把它在一起應該是這樣的：

SELECT fiscalYear, period, metricName, 
     [Actual] AS actualValue, [Plan] AS planValue, [PriorYear] AS priorYearValue 
FROM (SELECT fiscalYear, period, type, metricName, metricValue 
     FROM vw_ExecSummary 
     UNPIVOT (metricValue FOR metricName IN ([Net Revenue], [Total C.S. Salaries])) unpvt) unpvt 
PIVOT (SUM(metricValue) FOR type IN ([Actual], [Plan], [PriorYear])) AS pvt 

SQL Fiddle Example

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我只有一個顧慮，但：值一樣3676798.98999997，3503920.077405等，讓我覺得那些列浮點（即REAL或FLOAT），但值被命名爲貨幣用途。如果是這種情況....你是知道浮點值不能正確地存儲像.1的東西，正確（即，你實際上不能添加一個角錢的價值）？而且，當數值變得足夠大時，您不能再添加1？通常在處理貨幣價值時，您應該使用基於定點類型的東西，如DECIMAL或NUMERIC。

Answer 2

這是Itzig Ben-Gan's cross apply values pivoting一種情況：

create table #data (FiscalYear smallint, Period tinyint, ValueType nvarchar(25), NetRevenue float, Salaries float); 
insert into #data values 
    (15,1,N'Actual',3676798.98999,1463044.71999), 
    (15,1,N'Plan',3503920.977405,1335397.32878), 
    (15,1,N'PriorYear',4043634.449,1543866.89); 

select d.FiscalYear, d.Period, 
     ActualNetRevenue = sum(v.ActualNetRevenue), ActualSalaries = sum(v.ActualSalaries), 
     PlanNetRevenue = sum(v.PlanNetRevenue), PlanSalaries = sum(v.PlanSalaries), 
     PriorYearNetRevenue = sum(v.PriorYearNetRevenue), PriorYearSalaries = sum(v.PriorYearSalaries) 
from #data d 
cross apply 
     (values 
     (N'Actual',d.NetRevenue,d.Salaries,0,0,0,0), 
     (N'Plan',0,0,d.NetRevenue,d.Salaries,0,0), 
     (N'PriorYear',0,0,0,0,d.NetRevenue,d.Salaries)) 
     v (ValueType, ActualNetRevenue, ActualSalaries, PlanNetRevenue, PlanSalaries, PriorYearNetRevenue, PriorYearSalaries) 
where d.ValueType = v.ValueType 
group by d.FiscalYear, d.Period; 

drop table #data;