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我是新的 MDX 用户。

我可以使用 T-SQL 轻松获得我需要的东西，但使用 MDX 获得等价物已被证明是困难的。

use [AdventureWorksDW2012]

------------------------------------------------------------
--Select customers that purchased specific items during specific time period
------------------------------------------------------------ 
drop table #Customers_Purchased_SelectedProduct
select
distinct 
    a.CustomerKey
into #Customers_Purchased_SelectedProduct
from [dbo].[FactInternetSales] a
    inner join [dbo].[DimProduct] b on a.ProductKey = b.ProductKey
    inner join [dbo].[DimProductSubcategory] c on b.ProductSubcategoryKey = c.ProductSubcategoryKey
where
     a.ShipDateKey between 20050101 and 20081215
    and c.ProductSubcategoryKey in (1 , 2)

------------------------------------------------------------
--Get sales metrics for customers identified above
------------------------------------------------------------ 
select
    c.ProductSubcategoryKey
    , b.ProductKey
    , sum(a.SalesAmount) as SalesAmount
    , count(distinct a.CustomerKey) as 'CustomerDistinct_withPurchases'
from [dbo].[FactInternetSales] a
    inner join [dbo].[DimProduct] b on a.ProductKey = b.ProductKey
    inner join [dbo].[DimProductSubcategory] c on b.ProductSubcategoryKey = c.ProductSubcategoryKey
    inner join #Customers_Purchased_SelectedProduct bb on a.CustomerKey = bb.CustomerKey
where
    a.ShipDateKey between 20050101 and 20081215
    and c.ProductSubcategoryKey not in (1 , 2)
group by 
    c.ProductSubcategoryKey
    , b.ProductKey

下面的代码是我想出的。看起来非常笨重，2分钟后它返回数据并且不正确。

use [AdventureWorksDW2012]

------------------------------------------------------------
--Select customers that purchased specific items during specific time period
------------------------------------------------------------ 
drop table #Customers_Purchased_SelectedProduct
select
distinct 
    a.CustomerKey
into #Customers_Purchased_SelectedProduct
from [dbo].[FactInternetSales] a
    inner join [dbo].[DimProduct] b on a.ProductKey = b.ProductKey
    inner join [dbo].[DimProductSubcategory] c on b.ProductSubcategoryKey = c.ProductSubcategoryKey
where
     a.ShipDateKey between 20050101 and 20081215
    and c.ProductSubcategoryKey in (1 , 2)

------------------------------------------------------------
--Get sales metrics for customers identified above
------------------------------------------------------------ 
select
    c.ProductSubcategoryKey
    , b.ProductKey
    , sum(a.SalesAmount) as SalesAmount
    , count(distinct a.CustomerKey) as 'CustomerDistinct_withPurchases'
from [dbo].[FactInternetSales] a
    inner join [dbo].[DimProduct] b on a.ProductKey = b.ProductKey
    inner join [dbo].[DimProductSubcategory] c on b.ProductSubcategoryKey = c.ProductSubcategoryKey
    inner join #Customers_Purchased_SelectedProduct bb on a.CustomerKey = bb.CustomerKey
where
    a.ShipDateKey between 20050101 and 20081215
    and c.ProductSubcategoryKey not in (1 , 2)
group by 
    c.ProductSubcategoryKey
    , b.ProductKey
The code below is what I came up with.  Seems extremely clunky and after 2 minutes it returns data and isn't correct.

with

------------------------------------------------------------
----Select customers that purchased specific items during specific time period
------------------------------------------------------------ 
set [Cust] as
nonempty(
            [Dim Customer].[Customer Key].[Customer Key].members ,
            (
                ({[Dim Product].[Product Subcategory Key].&[1] ,[Dim Product].[Product Subcategory Key].&[2]}) ,
                ({[Ship Date].[Date Key].&[20050101]: [Ship Date].[Date Key].&[20081215]}) ,
                [Measures].[Sales Amount]
            )
        )

------------------------------------------------------------
--Create list of subcategories excluding the ones from above
------------------------------------------------------------ 

set [SubCategory Other] as
    except (
                [Dim Product].[Product Subcategory Key].[Product Subcategory Key]
            , ({[Dim Product].[Product Subcategory Key].&[1] ,[Dim Product].[Product Subcategory Key].&[2]})
            )

member [Sales Amount Selected Customers] as sum([Cust] , [Measures].[Sales Amount])
member [Customer Count] as count(nonempty([Cust],[Sales Amount Selected Customers]))

select 
{[Sales Amount Selected Customers] , [Customer Count]} on 0
, ([SubCategory Other] * [Dim Product].[Product Key].[Product Key]) on 1
 from [Adventure Works DW2012]

结果集不正确：

在此处输入图像描述

T-SQL 查询运行时间不到 1 秒。我显然在搞砸什么。

4

1 回答 1

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我的理解是，您希望在数据范围内获得产品及其子类别的销售额和不同客户数量。这些产品及其子类别是由在同一时期从子类别 1 和 2 购买商品的客户购买的。为此，您首先在临时表中获取客户列表，然后对于这些客户购买的所有产品，您将产品销售和不同的客户计数分组。

现在有几个问题。1) MDX 不支持子查询。因此，您没有直接的方法来收集您在 SQL 中所做的客户列表。

2) 在 MDX 中，您不能将单个维度属性放在两个轴上。将此转换为您的问题，您希望针对两种产品交叉分析所有产品销售（购物篮分析）。因此，理想情况下，在 MDX 中，解决方案应该是在两个轴上放置相同的维度属性，但这不受支持。

3）在您的 SQL 查询中，您仅使用事实互联网销售，在 MDX 中，您还使用 [Measures].[Sales Amount] 这不是来自互联网销售

4) 18484重复的原因是集合不知道查询上下文。简而言之，对于第 1 行，该集合不知道它正在执行组合 3, 560

于 2018-11-22T18:10:30.890 回答