Append Queries Broken?

[kmaranto]

Hello,

I'm trying to append two tables, one is roughly 6,000 rows the other is 12,000.  The append adds the data from the first query and includes the column headers from the second but none of the data from the second query is included.

I've tried recreating the query several times.  I've tried saving, quitting, restarting.  I'm at a complete loss.  Any help will be much appreciated.

[v-yaningy-msft · Accepted solution]

Hi, @kmaranto 

Thanks for the reply from @danextian and @Bibiano_Geraldo. When the amount of data in the two tables is too much there seems to be a problem that the data can not be displayed properly in the first place (the amount of data I am using here is about 70,000 rows, AdventureWorks2012.bak download link), and when appended as a new table, as shown below, the data can not be displayed properly.

As a workaround, you can change the order of any of the columns to display the data.

Best Regards,
Yang
Community Support Team

If there is any post helps, then please consider Accept it as the solution to help the other members find it more quickly.
If I misunderstand your needs or you still have problems on it, please feel free to let us know. Thanks a lot!

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[kmaranto]

Thank you very much Yang!  I think this is clearly a bug and not the expected behavior.  Do you happen to know if there is a method that we can use to raise this to the developers so that they might address it in a future update?

[v-yaningy-msft]

Hi, @kmaranto 

Based on the above information, It's a reproducible issue. Due to the new reply policy, I would suggest opening a Support Ticket.

If you are a Power BI Pro or Fabric licensee, you can create a support ticket for free and a dedicated Microsoft engineer will come to solve the problem for you. 
It would be great if you continue to share in this issue to help others with similar problems after you know the root cause or solution.

The link of Power BI Support: Support | Microsoft Power BI

For how to create a support ticket, please refer to How to create a support ticket in Power BI - Microsoft Power BI Community

Best Regards,
Yang
Community Support Team

[danextian]

Hi @kmaranto 

It is possible that after the append step, there are filter steps that remove the data from the second table. Check for any applied steps labeled 'Filtered Rows.' These are most likely just applicable to the first table.

[kmaranto]

Thanks for the reply @danextian, no filters are applied after the append.  I pasted the code in reply to bibian_geraldo below.  Based on Yang's response it looks like this is a replicable bug with large data sets.  Thanks again!

[Bibiano_Geraldo]

Hi @kmaranto ,

Please double check your applied steps to see if is there some step that filter out the new data to be added.

if possible, share with us the M code by going to advanced editor, is not easy to say withou see or interacting the problem.

Or try to append as new query to see if the problem persist.

[kmaranto]

Hi Bibiano, I've stripped the applied steps down to just the basics in terms of aligning the data types and renaming the headers for the fields that I want to combine.  I'm using the 'Append Queries' functionality on the ribbon to combine the two tables.

I've never had issues with this in the past.  This is about as basic as it gets.  Here is the code it produces:

let
    Source = Table.Combine({#"FCST Import", Actuals})
in
    Source

[Bibiano_Geraldo]

It seems that there's no problem with code, its possible to share no sensiitive file to see the problem closer?

[kmaranto]

I can also confirm I have the latest version of Power BI Desktop installed:  2.139.2054.0 64-bit (January 2025)