MDX 计算共同成员 - 存在替代

Posted 2023-03-29

【中文标题】MDX 计算共同成员 - 存在替代

【英文标题】：MDX to count common members - EXISTS alternative

【发布时间】：2015-01-10 10:55:23

【问题描述】：

让我以 [Adventure Works] 立方体为例来描述问题。

按照 MDX 返回计数 17473

SELECT NON EMPTY  [Measures].[Internet Order Count]  ON COLUMNS,

[Internet Sales Order Details].[Sales Order Number] on ROWS

FROM [Adventure Works])

WHERE ( [Sales Reason].[Sales Reason].&[1] -- price

以下返回计数为 3515

SELECT NON EMPTY  [Measures].[Internet Order Count]  ON COLUMNS ,

[Internet Sales Order Details].[Sales Order Number] on ROWS

FROM [Adventure Works]

WHERE ( [Sales Reason].[Sales Reason].&[2]) -- on promotion

我想统计一下[Sales Reason]中常见的[Sales Order Number]。&1和[Sales Reason]。&[2]

SQL 等效项是：

select count(distinct f.SalesOrderNumber)
from FactInternetSales f
join FactInternetSalesReason fs 
on f.SalesOrderNumber = fs.SalesOrderNumber and f.SalesOrderLineNumber = fs.SalesOrderLineNumber
where fs.SalesReasonKey = 1 and fs.SalesOrderNumber in
      (select SalesOrderNumber from FactInternetSalesReason fs1 where fs1.SalesReasonKey = 2)

-- sales reason 1 = 17473
-- sales reason 2 = 3515
-- common 1689

我使用以下 mdx 得到了常见计数：

WITH MEMBER [Measures].[common] AS count

   (  exists ( exists ([Internet Sales Order Details].[Sales Order Number].[Sales Order Number].Members,
         [Sales Reason].[Sales Reason].&[1],"Internet Orders" 
         ),
         [Sales Reason].[Sales Reason].&[2],"Internet Orders" 
        )
    )

SELECT NON EMPTY [Measures].[common] ON COLUMNS

FROM [Adventure Works] 

-- 1689

但是对于我的要求，使用 EXISTS 相当慢。请提出替代方案。

另请参阅相关主题here

谢谢

【参考方案1】：

请尝试将这两个原因作为一个集合添加到WHERE 子句中：

SELECT 
  NON EMPTY 
    [Measures].[Internet Order Count] ON COLUMNS
 ,[Internet Sales Order Details].[Sales Order Number] ON ROWS
FROM [Adventure Works]
WHERE 
  
    [Sales Reason].[Sales Reason].&[2]
   ,[Sales Reason].[Sales Reason].&[1]
  ;

这里有一个运行速度更快的替代方案，只看常见的命令，不使用EXISTS函数：

WITH 
  SET [AllOrders] AS 
    [Internet Sales Order Details].[Sales Order Number].[Sales Order Number].MEMBERS 
  SET [OrdersIntersection] AS 
    Intersect
    (
      NonEmpty
      (
        [AllOrders]
       ,
          (
            [Sales Reason].[Sales Reason].&[1]
           ,[Measures].[Internet Order Count]
          )
        
      )
     ,NonEmpty
      (
        [AllOrders]
       ,
          (
            [Sales Reason].[Sales Reason].&[2]
           ,[Measures].[Internet Order Count]
          )
        
      )
    ) 
  MEMBER [Measures].[commonCount] AS 
    [OrdersIntersection].Count 
SELECT 
  //NON EMPTY //<<not needed
    [Measures].[commonCount] ON COLUMNS
FROM [Adventure Works];

【讨论】：

我需要“销售原因”1 和 2 中常见的“互联网订单数”，而不是总数。

@PrakashGautam - 我误解了你的问题。我在我的帖子中添加了一个替代方案。您的 exists 脚本在我的机器上运行时间为 1.1 秒，而我的交集版本运行时间为 0.8 秒。

感谢@whytheq，Intersect 的运行速度确实比 Exists 快。