0

我一直在考虑将一些深入查询从 T-SQL 转移到 DAX 以提高性能。我并没有真正将 DAX 用作一种查询语言，并且一直在努力寻找可以让我转换以下简单 SQL 查询的示例。我设法找到了过滤表和连接表的示例，但没有在 DAX 中将这些操作组合在一起的真实示例。

我要转换的以下查询包含联接和过滤表。是否可以在 DAX 中重写它？

我担心的另一个问题是 fp.[Fact Product Id] 列具有非常高的基数，实际上是退化维度。当我尝试在 MDX 中重写它以针对表格多维数据集运行时，查询需要很长时间并最终因内存不足错误而崩溃。DAX 查询会遇到同样的问题吗？

Select dcpss.[Customer Product Status Rollup],
    dcpss.[Customer Product Status],
    dc.[Customer Id],
    dc.[Customer Name],
    dcps.[Customer Product Source],
    dp.Country,
    dp.[Product Number],
    dp.[Product Name],
    drbi.[Incident Number] As [Renewed By Order Number],
    drbi.[Incident Status] As [Renewed By Order Status],
    fp.[Fact Product Id] As [Product Id],
    fp.[Product Count],
    ded.[Date] As [Expiry Date]
From [rpt].[Fact Product] fp
    Inner Join [rpt].[Active Dim Product]  dp On dp.[Historical Product Key] = fp.[Product Key]
    Inner Join [rpt].[Active Dim Customer] dc On dc.[Historical Customer Key] = fp.[Product Customer Key]
    Inner Join [rpt].[Dim Expiry Date] ded On ded.[Expiry Date Key] = fp.[Expiry Date Key]
    Inner Join [rpt].[Dim Customer Product Source] dcps On dcps.[Customer Product Source Key] = fp.[Customer Product Source Key]
    Inner Join [rpt].[Dim Customer Product Status] dcpss On dcpss.[Customer Product Status Key] = fp.[Customer Product Status Key]
    Inner Join [rpt].[Dim Renewed By Incident] drbi On drbi.[Renewed By Incident Key] = fp.[Renewed By Incident Key]
Where ded.[Month of Year Name] = 'June'
    And ded.[Year Name] = 2015
    And (ded.[Day of Month] = @DayOfMonth Or @DayOfMonth Is Null)
    And dcps.[Customer Product Source] <> 'Free PP Product'
    And dc.[Payment Type] <> 'Free'
    And dp.Country = 'AU'
    And dp.[Sales Type] <> 'Trial';
4

1 回答 1

0

好的，我终于解决了这个问题。我确信查询可能会写得更好，但是在此处使用有关投影的文章和有关过滤的文章显示了如何仅使用 Summarize 和 CalculateTable 函数。

请注意，这会返回不同的行（无重复），这在此处不是问题，因为我包括了主键字段 [Fact Product Id]。

Evaluate
CalculateTable (
    Summarize(
        'Transactions',
        'Customer Product Status'[Customer Product Status Rollup],
        'Customer Product Status'[Customer Product Status],
        'Active Customer'[Customer Id],
        'Active Customer'[Customer Name],
        'Customer Product Source'[Customer Product Source],
        'Active Product'[Country],
        'Active Product'[Product Number],
        'Active Product'[Product Name],
        'Renewed by Order'[Incident Number],
        'Renewed by Order'[Incident Status],
        'Transactions'[Fact Product Id],
        'Transactions'[Product Count],
        'Expiry Date'[Date]
    ),
    'Expiry Date'[Month of Year Name] = "June",
    'Expiry Date'[Year Name] = "2015",
    'Expiry Date'[Day of Month] = Blank() || IsBlank(Blank()),
    'Customer Product Source'[Customer Product Source] <> "Free PP Product",
    'Active Customer'[Payment Type] <> "Free",
    'Active Product'[Country] = "AU",
    'Active Product'[Sales Type] <> "Trial"
)
于 2015-07-05T21:52:25.167 回答