基于尺寸值的MDX计算度量

我不熟悉mdx和SSAS，我们正在尝试将存储过程转换为mdx查询。我有一个立方体，如下所示：

事实表：

         [Target] (FK),
         [Date] (FK),
         [Action] (FK),
         [Amount] (Measure),

暗淡日期：

        [DateKey] (pk),
        [Date],
        [DayOfYear],
        [DayofWeek],
        [....]

Dim操作：有四种操作（添加、删除、连接等）

暗淡目标：

        [ID] (PK)
        [Name] 

我想创建一个计算度量，就像我们在t-sql中所做的那样

 SELECT ....,


   CASE 
         WHEN a.[Action]='added' 

         THEN DATEDIFF(DAY, a.[Date],GETUTCDATE()) 
         ELSE DATEDIFF(DAY, a.[Date],GETUTCDATE())*-1
         END


 AS 'Lifespan'

 FROM FilterData a 
 GROUP BY a.[Target]

问题：我怎样才能创建一个计算出的寿命指标

我尝试了以下操作，但失败，[Dim Action Types].[Name]。CURRENTMEMBER始终为“ALL”

我可以通过查询获得一些数据：

---

得到这样的输出

---

但这不会有多大帮助，我希望这个timespan值作为每个数据库行的“数量”这样的度量，然后我可以进行求和。。。这很难解释。事实上，它应该是一个名为“timespan”（度量）的列，但它是按今天的日期计算的，不能在datatable中创建，后来我使用GETDATE（）在dsv中创建了一个命名的计算列。但是GETDATE（）是处理日期，所以我必须在这里创建一个计算的度量值

我在t-sql中使用的查询：

 SELECT DATENAME(DAY,a.[Date])+'/'+ DATENAME(MONTH,a.[Date]) AS 'X',
 SUM(CASE WHEN a.[Action]='added' THEN DATEDIFF(DAY, a.[Date],GETDATE()) 
 ELSE                           DATEDIFF(DAY, a.[Date],GETDATE())*-1 END)
 AS 'TimeSpan',
 FROM FactData a
 GROUP BY a.[Date]

---

[Dim Action Types]也需要在行上，因为当前在[Dim Action Types]*[Dim Action Targets]上没有交叉-请告诉我它是否有效

With Member [Measures].[LifeSpan] as
CASE  
WHEN  [Dim  Action Types].[Name].CURRENTMEMBER IS [Dim  Action Types].[Name].&[added] THEN  1*'datediff("d",[Dim Date].[Date],Now()) '
WHEN [Dim  Action Types].[Name].CURRENTMEMBER IS  [Dim  Action Types].[Name].&[removed] THEN -1*'datediff("d",[Dim Date].[Date],Now()) '
ELSE  0
End 
select [Measures].[LifeSpan] on columns,
[Dim Action Targets].[Name].Children on rows
from [OLAP Prep]

WITH MEMBER [Measures].[TimeSpan] as 
case
 WHEN [Action Types].[Name].CURRENTMEMBER IS [Action Types].[Name].&[added]       THEN datediff('D',[Date].[Date].CURRENTMEMBER.NAME,Now())
WHEN [Action Types].[Name].CURRENTMEMBER IS  [Action Types].[Name].&  [removed] THEN -datediff('D',[Date].[Date].CURRENTMEMBER.NAME,Now())
ELSE  0
END

SELECT [Measures].[TimeSpan] ON 0,
NONEMPTY([Date].[Date].Children*[Action Types].[NAME].Children)on 1
FROM [OLAP Prep]

                           TimeSpan
2014-07-23 00:00:00.000 added
  34
2014-07-23 00:00:00.000 connected
     0
2014-07-23 00:00:00.000 disconnected
     0
2014-07-23 00:00:00.000 removed
     -34
2014-07-25 00:00:00.000 added
  32
2014-07-25 00:00:00.000 connected
0
2014-07-25 00:00:00.000 disconnected
 0
 2014-08-04 00:00:00.000 added
   22

 SELECT DATENAME(DAY,a.[Date])+'/'+ DATENAME(MONTH,a.[Date]) AS 'X',
 SUM(CASE WHEN a.[Action]='added' THEN DATEDIFF(DAY, a.[Date],GETDATE()) 
 ELSE                           DATEDIFF(DAY, a.[Date],GETDATE())*-1 END)
 AS 'TimeSpan',
 FROM FactData a
 GROUP BY a.[Date]