topic Re: Power Query - Replacing empty cells in source with null in M query in Developer

Power Query - Replacing empty cells in source with null in M query

NithyaKB — Wed, 23 Feb 2022 14:16:43 GMT

Hi,
I have a table in which say for example in a table column title has empty values for few rows .I am expanding my table in Power query and fetching only the title column.For few rows it is showing as error .I tried replacing errors with null however it worked but it is taking longer time . Is there anyway where I can check in if the table has empty rows then replace that with null else the values in title column for each row.

M query:
let
Source = SharePoint.Tables("sharepoint site url",
#" " = Source{[Id=" "]}[Items],
#"Renamed Columns" = Table.RenameColumns(#" ",{{"ID", "ID.1"}}),
#"Removed Other Columns" = Table.SelectColumns(#"Renamed Columns",{"Id", "Title", "Modified", "Created"),
#"Expanded Author" = Table.ExpandRecordColumn(#"Removed Other Columns", "Author", {"Title"}, {"Author.Title"}),
#"Renamed Columns1" = Table.RenameColumns(#"Expanded Author",{{"Author.Title", "Author"}}),
#"Expanded Handler" = Table.ExpandRecordColumn(#"Renamed Columns1", "Handler", {"Title"}, {"Handler.Title"}),
#"Renamed Columns2" = Table.RenameColumns(#"Expanded Handler",{{"Handler.Title", "Handler"}}),
#"Expanded Assigned" = Table.ExpandRecordColumn(#"Renamed Columns2", "Assigned", {"Title"}, {"Assigned.Title"})
in
#"Expanded Assigned"

In the aboce m query the error is in the step #"Expanded Assigned" . I need the solution to belike if column title is blank then it should be null else it should give the value .So during expanding the column I need to check on this condition.
Any suggestions please?

Above is the error message and the error.

Re: Power Query - Replacing empty cells in source with null in M query

lbendlin — Sun, 27 Feb 2022 00:16:54 GMT

Remember that you can run ODATA queries that can pre-filter those rows.

Re: Power Query - Replacing empty cells in source with null in M query

NithyaKB — Sun, 27 Feb 2022 13:40:57 GMT

Hi,
Yeah but we are in a need to import data through sharepoint online. Can you please suggest the changes to be added in m query.

Re: Power Query - Replacing empty cells in source with null in M query

lbendlin — Sun, 27 Feb 2022 14:15:36 GMT

various options:

- add a step to replace errors

- use try ... otherwise ...

- investigate the cell contents with Value.Is before attempting to expand it.

Re: Power Query - Replacing empty cells in source with null in M query

NithyaKB — Mon, 28 Feb 2022 03:03:37 GMT

Hi,
Can you please help me out with the exact m query

Re: Power Query - Replacing empty cells in source with null in M query

Anonymous — Tue, 01 Mar 2022 05:55:23 GMT

HI @NithyaKB,

You can refer to the following links to know how to process these errors.

Odata wiht URL Conventions:

OData URL Conventions

Power query error handling:

Error handling - Power Query | Microsoft Docs

Dealing with errors - Power Query | Microsoft Docs

Regards,

Xiaoxin Sheng