逆透视数据与多列 - 语法帮助请

Question

我有，我想UNPIVOT

我创造了这个查询UNPIVOT的“实际”行，但似乎无法以下数据找出未计划'计划'和'优先'的语法。

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

逆转置数据看起来是这样，但我想还计划和PriorYear列添加到ActualValue栏的右侧下方

任何帮助将不胜感激。谢谢。

Answer 1

我目前无法测试此功能，但我认为它可以像这样工作。首先，你需要UNPIVOT所有数据：

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

应该产生看起来是这样的一个表，该表：

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) 

然后我们可以PIVOT行正常，以获得新的列（这就是它的用途）：

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(...)实际上不应该做一个ything这里，作为推测其他列包含唯一行，但我们需要使用聚合函数）

...这应该产生一个类似于如下：

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

所以把它在一起应该是这样的：

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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我只有一个顾虑，但：值一样3676798.98999997，3503920.077405等，让我觉得那些列浮点（即REAL或FLOAT），但值被命名为货币用途。如果是这种情况....你是知道浮点值不能正确地存储像.1的东西，正确（即，你实际上不能添加一个角钱的价值）？而且，当数值变得足够大时，您不能再添加1？通常在处理货币价值时，您应该使用基于定点类型的东西，如DECIMAL或NUMERIC。

Answer 2

这是Itzig Ben-Gan's cross apply values pivoting一种情况：

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;