Excel Power Query：在列值上使用List.MatchAny [英] Excel Power Query: Using List.MatchAny on a column value

问题描述

在Excel Power Query中，我有一张表。列A有单个数字。我想标记列A值与列表匹配的记录。问题的一个截止版本是：

In Excel Power Query, I have a table. Column A has single numbers. I want to mark those records where the Column A value matches a list. A cutdown version of the problem is:

let
    TableA = Table.FromColumns({{1,2,4}}, {"A"}),
    ListB = {4,5,6 },
    DPart = Table.AddColumn(TableA, "IsInB", 
            List.MatchesAny(ListB, each _ = [A]))
in
    DPart

DPart行中的错误

I get an error in the DPart line

Expression.Error: We cannot apply field access to the type Number.
Details:
  Value=4
  Key=A

显然，代码试图访问列表的[A]列，而不是TableA的[A]列。

Apparently, the code is trying to access the [A] column of elements of the list, instead of the [A] column of TableA.

完成此操作的正确语法是什么？

What's the correct syntax to accomplish this?

推荐答案

这样做：

let
    TableA = Table.FromColumns({{1,2,4}}, {"A"}),
    ListB = {4,5,6 },
    DPart = Table.AddColumn(TableA, "IsInB", 
            (x) => List.MatchesAny(ListB, each _ = x[A]))
in
    DPart

但我宁愿：

let
    TableA = Table.FromColumns({{1,2,4}}, {"A"}),
    ListB = {4,5,6 },
    DPart = Table.AddColumn(TableA, "IsInB", 
            each List.Contains(ListB, _[A]))
in
    DPart

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