Convert Sharepoint list sublists to tables in Power BI Desktop

[Thejeswar]

Hi Guys,

The Below is my scenario

I have a Sharepoint list which is having multiple other lists associated with it. This I can see if I import the list into Power BI using the Sharepoint List Data Connector.

Suppose A is my list and it has B and C as the associated list.

When I import data from List A, the import takes a couple of minutes.

Now if I expand any of my sublists B or C, the data import is becoming very slow. I takes more than 7 hours in my case.

So to avaid this I thought of using the associated lists as separate tables in power bi. Now the limitation that I am facing is,

How do I convert the Sublist as a separate table.?

P.S. For the information, if I expand the needed list to a new query from the sublists for list A, the new query gets created. But this also happens on top of the existing List A

can someone let me know how to handle this?

[v-juanli-msft]

Hi @Thejeswar

To expand the needed list to a new query from the sublists for list A without happening on top of the existing List A, please create a blank query, then in advanced editor, input the following code.

let
    Source = Table1,
    #"Added Custom" = Table.AddColumn(Source, "Custom", each Table.FromList([Custom1],Record.FieldValues)),
    #"Removed Columns" = Table.RemoveColumns(#"Added Custom",{"somethng", "DateStart", "DateEnd", "Custom1", "Custom2"}),
    #"Expanded Custom" = Table.ExpandTableColumn(#"Removed Columns", "Custom", {"Column1", "Column2"}, {"Custom.Column1", "Custom.Column2"})
in
    #"Expanded Custom"

Best Regards

Maggie

[Thejeswar]

Hi,

I did this. But it is giving me error that "cannot convert Value of type Record to Type Table"

What could be the reason?

let
    Source = #"MySource",
    #"Added Custom" = Table.AddColumn(Source, "Custom", each Table.FromList([Custom1],Record.FieldValues)),
    #"Removed Columns" = Table.RemoveColumns(#"Added Custom",{"somethng", "DateStart", "DateEnd", "ColumnA", "ColumnB"}),
    #"Expanded Atr" = Table.ExpandTableColumn(#"Removed Columns", "Atr", {"Id", "Title"}, {"Atr.Id", "Atr.Title"}),
    #"Removed Errors" = Table.RemoveRowsWithErrors(#"Expanded Atr", {"Atr.Id"}),
    #"Removed Duplicates" = Table.Distinct(#"Removed Errors", {"Atr.Id"})
in
    #"Removed Duplicates"

This is my M-Query for reference.

[v-juanli-msft · Accepted solution]

Hi @Thejeswar

I can reproduce your problem.

Please pay attention to the characters colored.

let

    Source = Table1,

    #"Added Custom" = Table.AddColumn(Source, "Custom", each Table.FromList([Custom1],Record.FieldValues)),

    #"Removed Columns" = Table.RemoveColumns(#"Added Custom",{"somethng", "DateStart", "DateEnd", "Custom1", "Custom2"}),

    #"Expanded Custom" = Table.ExpandTableColumn(#"Removed Columns", "Custom", {"Column1", "Column2"}, {"Custom.Column1", "Custom.Column2"})

in

    #"Expanded Custom"

The character with the same color should be the same name.

Please look at my pbix for reference.

Best Regards

Maggie