查询中无法识别电源双开关

Question

已使用以下代码创建自定义列，但卡在无法识别 SWITCH 函数的表达式错误处：

= Table.AddColumn(#"Removed Columns", "Empolyees", each SWITCH([Index],  
1, Empolyees = "Chris1",   
2, Empolyees = "Chris2",
3, Empolyees = "Chris3",
4, Empolyees = "Chris4", 
5, Empolyees = "Chris5",
6, Empolyees = "Chris6",
7, Empolyees = "Chris7",
8, Empolyees = "Chris8",
BLANK()
))

我试过删除引号，更改列名，但都没有 avail.Please 建议。提前致谢！

Answer 1

你搞混了 M and DAX. They are two different languages, and both are used in Power BI. SWITCH() 是一个 DAX 函数，因此它不能用在你写的 M query 中。

您可以用 M:

中的 if-then-else expression 替换 SWITCH 逻辑

= Table.AddColumn(#"Removed Columns", "Employees", each if [Index] = 1 then "Chris1" else if [Index] = 2 then "Chris2" else if [Index] = 3 then "Chris3" else if [Index] = 4 then "Chris4" else if [Index] = 5 then "Chris5" else if [Index] = 6 then "Chris6" else if [Index] = 7 then "Chris7" else if [Index] = 8 then "Chris8" else "")

具体看你想实现什么，也可以使用其他函数，但我暂时保持这种方式，而不是做任何假设。

Answer 2

将员工列表存储在 table 中并将其与您的查询合并会更好。您可以在查询中生成 table - 例如：

let
    Source = Excel.CurrentWorkbook(){[Name="MyTable"]}[Content],
    TempTable = #table(
        {"ID","Name"},{
            {1,"Employee 1"},
            {2,"Employee 2"},
            {3,"Employee 3"},
            {4,"Employee 4"},
            {5,"Employee 5"}
            }
        ),
    #"Merged Queries" = Table.NestedJoin(Source,{"ID"},TempTable,{"ID"},"Join",JoinKind.LeftOuter),
    #"Expanded Join" = Table.ExpandTableColumn(#"Merged Queries", "Join", {"Name"}, {"Name"})
in
    #"Expanded Join"

更好的做法是将员工 ID/姓名存储在单独的 table 中，然后以相同的方式加入。

查询中无法识别电源双开关

power bi switch is unrecognized in query

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