识别一条记录是否有很多产品

Question

我同时使用 Access 和 Power BI 来解决这个问题，但无济于事。原则上其实很简单，但我需要以特定的方式来做，以便后续的定价计算。

本质上，我有一个 table 交易和服务 ID。此服务 ID 将在一个或多个产品中出现多次。如果它只是一个产品，那么我需要用 "Single Product" 填充一列，否则 "Multiple Product"。见下图：

Serviceid  Product  Type
1          A        Multiple Products
1          B        Multiple Products
2          A        Single Product
3          A        Single Product
3          A        Single Product
3          A        Single Product

Answer 1

您可以使用 IIF() 和 EXISTS 来填充新列

select
  t.serviceid,
  t.product,
  iif(
    exists (
      select 1 from tablename where serviceid = t.serviceid and product <> t.product
    ),
    'Multiple Products',
    'Single Product'
  ) as type
from tablename as t

Answer 2

在 Power BI 中，您可以在 Power Query 中执行此操作：

let
    Source = SourceTable,
    fnDistinct = (MyTable, MyServiceid) =>
        let
            #"Filtered Rows" = Table.SelectRows(MyTable, each ([Serviceid] = MyServiceid)),
            #"Distinct Products" = List.Count(List.Distinct(#"Filtered Rows"[Product]))
        in
            #"Distinct Products",
    #"Added M Type" = Table.AddColumn(Source, "M Type", each if fnDistinct(Source, [Serviceid]) > 1 then "Multiple Products" else "Single Product", type text)
in
    #"Added M Type"

或使用 DAX：

DAX Type = 
VAR CountProducts = 
    CALCULATE(
        DISTINCTCOUNT ( Table1[Product] ),
        ALLEXCEPT ( Table1, Table1[Serviceid] )
    )
RETURN
    SWITCH ( 
        CountProducts,
        1, "Single Product",
        "Multiple Products"
    )

工作示例 PBIX 文件：https://pwrbi.com/so_55918190/

性能测试 DAX 解决方案，250,000 行：

Answer 3

使用简单的子查询：

Select 
    Serviceid,
    Product,
        IIf((Select Count(*) 
        From  YourTable As T
        Group By Serviceid, Product
        Having T.Serviceid = YourTable.Serviceid And T.Product = YourTable.Product) = 1, "Single Product", "Multiple Products") As [Type]
From
    YourTable
Group By
    Serviceid,
    Product

识别一条记录是否有很多产品

Identify whether a record has many products

ms-access

powerpivot

powerquery

powerbi