通过变量引用列 [英] Reference a column by a variable

问题描述

我想在创建另一列时通过变量引用表列，但我无法获得语法:

I want to reference a table column by a variable while creating another column but I can't get the syntax:

    t0 = Table.FromRecords({[a = 1, b = 2]}),
    c0 = "a", c1 = "b",
    t1 = Table.AddColumn(t0, "c", each([c0] + [c1]))

我收到错误未找到记录的字段c0".它将 c0 理解为文字，但我想要 c0 中包含的文本值.怎么做?

I get the error the record's field 'c0' was not found. It is understanding c0 as a literal but I want the text value contained in c0. How to do it?

我使用这个灵感来自接受的答案:

I used this inspired by the accepted answer:

    t0 = Table.FromRecords({[a = 1, b = 2]}),
    c0 = "a", c1 = "b",
    t1 = Table.AddColumn(t0, "c", each(Record.Field(_, c0) + Record.Field(_, c1)))

推荐答案

另一种方式:

let
    t0 = Table.FromRecords({[a = 1, b = 2]}),
    f = {"a","b"},
    t1 = Table.AddColumn(t0, "sum", each List.Sum(Record.ToList(Record.SelectFields(_, f))))
in
    t1

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