powerquery - 使用 Power Query / Get & Transform (Excel 2016) 组合表格

Question

如何根据公共索引列“国家”组合多个表格以生成货币转换，如下图所示：

当地货币交易 * 汇率 = 货币调整

Answer 1

我不认为（A）和（B）的数学与（C）一致。如果我有 2 英镑，那应该接近 3 美元，而不是 30 美分。

您想要组合两个表之间的行通常称为左连接。您可以单击合并按钮来合并行。您想从 (A) 进行连接并将 (B) 添加到其中。一旦你有了它，你可以使用添加列和乘法来计算货币汇率并应用它。

完成的解决方案类似于最终查询：

section Section1;

shared LocalCurrencyTransactions = let
    Source = Csv.Document("Country,LocalCurrencyAmounts
    US,1
    UK,2.13
    JAPAN,328.08
    INDIA,66.56
    US,2
    UK,0.71
    JAPAN,109.36
    INDIA,133.12"),
    #"Promoted Headers" = Table.PromoteHeaders(Source),
    #"Changed Type" = Table.TransformColumnTypes(#"Promoted Headers",{{"Country", type text}, {"LocalCurrencyAmounts", type number}})
in
    #"Changed Type";

shared #"FX Rates" = let
    Source = Csv.Document("Country,LocalCurrency,USD
    US,1,$1.00
    UK,0.71,$1.00
    JAPAN,109.36,$1.00
    INDIA,66.56,$1.00"),
    #"Promoted Headers" = Table.PromoteHeaders(Source),
    #"Changed Type" = Table.TransformColumnTypes(#"Promoted Headers",{{"Country", type text}, {"LocalCurrency", type number}, {"USD", Int64.Type}})
in
    #"Changed Type";

shared CurrencyAdjustedToUSD = let
    Source = LocalCurrencyTransactions,
    #"Merged Queries" = Table.NestedJoin(Source,{"Country"},#"FX Rates",{"Country"},"NewColumn",JoinKind.LeftOuter),
    #"Expanded NewColumn" = Table.ExpandTableColumn(#"Merged Queries", "NewColumn", {"LocalCurrency", "USD"}, {"NewColumn.LocalCurrency", "NewColumn.USD"}),
    #"Inserted Division" = Table.AddColumn(#"Expanded NewColumn", "NewColumn.ConversionRate", each [NewColumn.USD] / [NewColumn.LocalCurrency], type number),
    #"Inserted Multiplication" = Table.AddColumn(#"Inserted Division", "USD", each List.Product({[LocalCurrencyAmounts], [NewColumn.ConversionRate]}), type number),
    #"Removed Columns" = Table.RemoveColumns(#"Inserted Multiplication",{"NewColumn.LocalCurrency", "NewColumn.USD", "NewColumn.ConversionRate"})
in
    #"Removed Columns";