Lỗi the key didnt match any rows in the table

I figured out the cause of my problem and the solution. The issue is that the row in my template query was being referenced incorrectly (i.e., the primary key between the template query and the regular query is wrong, and it has hard-coding of sheet names). To fix that, I had to remove all other columns in the template query table except the Data column, as described here. (It's odd that no MS documentation on combining multiple Excel files discusses this very important step.)

For comparison, here is my former (incorrect) M code:

Transform Sample File:

let
    Source = Excel.Workbook(Parameter1, null, true),
    #"Sample_Sheet" = Source{[Item="sample",Kind="Sheet"]}[Data],
    #"Promoted Headers" = Table.PromoteHeaders(#"Sample_Sheet", [PromoteAllScalars=true])
in
    #"Promoted Headers"

test:

let
    Source = Folder.Files("C:\some folder path"),
    #"Filtered Hidden Files1" = Table.SelectRows(Source, each [Attributes]?[Hidden]? <> true),
    #"Invoke Custom Function1" = Table.AddColumn(#"Filtered Hidden Files1", "Transform File", each #"Transform File"([Content])),
    #"Renamed Columns1" = Table.RenameColumns(#"Invoke Custom Function1", {"Name", "Source.Name"}),
    #"Removed Other Columns1" = Table.SelectColumns(#"Renamed Columns1", {"Source.Name", "Transform File"}),
    #"Expanded Table Column1" = Table.ExpandTableColumn(#"Removed Other Columns1", "Transform File", Table.ColumnNames(#"Transform File"(#"Sample File"))),
    #"Changed Type" = Table.TransformColumnTypes(#"Expanded Table Column1",{{"Source.Name", type text}, {"ID", type text}, {"Name", type text}})
in
    #"Changed Type"

And here is my new (correct) code:

Transform Sample File:

let
    Source = Excel.Workbook(Parameter1, null, true),
    #"Removed Columns" = Table.RemoveColumns(Source,{"Name", "Item", "Kind", "Hidden"}),
    Data = #"Removed Columns"{0}[Data],
    #"Promoted Headers" = Table.PromoteHeaders(Data, [PromoteAllScalars=true]),
    #"Changed Type" = Table.TransformColumnTypes(#"Promoted Headers",{{"ID", type text}, {"Name", type text}})
in
    #"Changed Type"

test:

let
    Source = Folder.Files("C:\some folder path"),
    #"Filtered Hidden Files1" = Table.SelectRows(Source, each [Attributes]?[Hidden]? <> true),
    #"Invoke Custom Function1" = Table.AddColumn(#"Filtered Hidden Files1", "Transform File", each #"Transform File"([Content])),
    #"Renamed Columns1" = Table.RenameColumns(#"Invoke Custom Function1", {"Name", "Source.Name"}),
    #"Removed Other Columns1" = Table.SelectColumns(#"Renamed Columns1", {"Source.Name", "Transform File"}),
    #"Expanded Table Column1" = Table.ExpandTableColumn(#"Removed Other Columns1", "Transform File", Table.ColumnNames(#"Transform File"(#"Sample File")))
in
    #"Expanded Table Column1"

Notice the 'Removed Columns' step in the new template query. This is the "secret sauce" to the key problem. Also notice that I kept all default steps after my 'Data' step (i.e., 'Promoted Headers' and 'Changed Type') in my template query. This is because all of my sheets have the same schema. If this weren't true, then I would need to move those steps to the regular query.

I connected to a folder that currently has two files. The files are structured exactly the same way. Each file has a table and same exact columns. When I connected, I clicked on Combine & Transform Data.

I made all my transformations on the Transform Sample File, I created connection only and added to data model and then came across this error.

What step am I forgetting?

Any assistance would be greatly appreciated.

JG

Mynda Treacy

Admin

Forum Posts: 4652

Member Since: July 16, 2010

2

May 9, 2022 - 8:53 am

Hi Jose,

Welcome to our forum!

This error is caused by a name being referred to in your query for specific table or column names that are no longer present in your source data. e.g. when you originally built the query a table might have been named TableA, but now it's named TableB and therefore the query can't find TableA. Of course it could also be renamed columns.