条件列中的Power Query IN运算符

Question

如何修改Power BI M代码

= Table.AddColumn(#"PreviousStep", "Tag", each 
     if Text.Contains([Column1]) = "value1" then "bingo" 
else if Text.Contains([Column1]) = "value2" then "bingo"
else if Text.Contains([Column1]) = "value3" then "bingo"
else ["Some other value"])

成一行类似于SQL的代码

case when [Column1] in ("value1", "value2", "value3") then "bingo" else "Some other value" end

我不想重复else if的行，但是以类似的方式使用它

List.Contains({'Value1', 'Value2', 'Value3'}, [Column1])

在这里使用：https://stackoverflow.com/a/51749519/1903793

Answer 1

您必须使用List.Transform生成Text.Contains函数调用，然后使用List.AnyTrue检查Column1是否包含任何文本。

= Table.AddColumn(#"PreviousStep", "Tag", each if List.AnyTrue(List.Transform({"value1", "value2", "value3"}, (s) => Text.Contains([Column1], (s)))) then "bingo" else "Some other value")

结果：

Reference

Answer 2

如果你想比较整个单词，你应该使用List.ContainsAny函数

let
    haystack = #table({"col"}, {{"qwer"}, {"asdf"}, {"zxcv"}, {"zxwecv"}, {"other"}}),
    needles = {"qwer", "zxcv"},
    add = Table.AddColumn(haystack, "Tag", each if List.ContainsAny(needles, {[col]}) then "bingo" else "Some other value")
in
    add

但是如果你搜索一部分单词，答案会变得有点复杂

let
    haystack = #table({"col"}, {{"qwer"}, {"asdf"}, {"zxcv"}, {"zxwecv"}, {"other"}}),
    needles = {"we", "as"},
    add = Table.AddColumn(haystack, "Tag", each if List.MatchesAny(needles, (s)=>Text.Contains([col], s)) then "bingo" else "Some other value")
in
    add