Excel 如何应用多个if-then-else语句？

我希望开发一个excel模型，使用powerpivot/和power query从数据仓库中提取大量数据，然后根据特定规则执行一系列操作

我已经完成了第一部分，但是，我正在努力应用规则。简言之，模型应该首先检查规则1是否正确，如果不正确，那么它应该检查规则2是否正确，如果规则3不正确等等

可能有多个规则是正确的，但是，应用的操作应基于规则的顺序

一系列if语句可能会起作用，但我希望避免这种情况

感谢您的帮助/建议

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我相信这是一种方法，使用外部联接

如果您有一个规则表（规则）：

和一个记录表（记录）：

您可以合并每个表中的变量列，然后合并（联接）两个表，使用规则和记录表中新合并的变量列作为键匹配；然后拆分新合并表中的合并变量列，以最终获得此比较结果表（比较）：

以下是规则表中的M代码：

let
Source = Excel.CurrentWorkbook(){[Name="Table1"]}[Content],
#"Changed Type" = Table.TransformColumnTypes(Source,{{"Rule #", Int64.Type}, {"Variable 1", type text}, {"Variable 2", type text}, {"Variable 3", type text}, {"Variable 4", type text}, {"Variable 5", type text}}),
#"Demoted Headers" = Table.DemoteHeaders(#"Changed Type"),
#"Merged Columns" = Table.CombineColumns(#"Demoted Headers",{"Column2", "Column3", "Column4", "Column5", "Column6"},Combiner.CombineTextByDelimiter(",", QuoteStyle.None),"Merged")
in
#"Merged Columns"

以下是记录表中的M代码：

let
Source = Excel.CurrentWorkbook(){[Name="Table15"]}[Content],
#"Changed Type" = Table.TransformColumnTypes(Source,{{"Record", type text}, {"Variable 1", type text}, {"Variable 2", type text}, {"Variable 3", type text}, {"Variable 4", type text}, {"Variable 5", type text}}),
#"Demoted Headers" = Table.DemoteHeaders(#"Changed Type"),
#"Merged Columns" = Table.CombineColumns(#"Demoted Headers",{"Column2", "Column3", "Column4", "Column5", "Column6"},Combiner.CombineTextByDelimiter(",", QuoteStyle.None),"Merged")
in
#"Merged Columns"

下面是比较表中的M代码：

let
Source = Table.NestedJoin(Records,{"Merged"},Rules,{"Merged"},"NewColumn",JoinKind.FullOuter),
#"Expanded NewColumn" = Table.ExpandTableColumn(Source, "NewColumn", {"Column1"}, {"NewColumn.Column1"}),
#"Split Column by Delimiter" = Table.SplitColumn(#"Expanded NewColumn","Merged",Splitter.SplitTextByDelimiter(",", QuoteStyle.Csv),{"Merged.1", "Merged.2", "Merged.3", "Merged.4", "Merged.5"}),
#"Changed Type" = Table.TransformColumnTypes(#"Split Column by Delimiter",{{"Merged.1", type text}, {"Merged.2", type text}, {"Merged.3", type text}, {"Merged.4", type text}, {"Merged.5", type text}}),
#"Promoted Headers" = Table.PromoteHeaders(#"Changed Type", [PromoteAllScalars=true]),
#"Renamed Columns" = Table.RenameColumns(#"Promoted Headers",{{"Rule #", "Rule # Matched"}})
in
#"Renamed Columns"