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Removing columns in Power BI source file|Power Query|Excel Forum|My Online Training Hub

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sp_CrumbsHome HomeExcel ForumPower QueryRemoving columns in Power BI source…
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Removing columns in Power BI source file
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Paul Pritchard
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March 29, 2023 - 11:11 am
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Lets say I have an excel table with 100 columns and I load this into Power BI, however I only want to use 30 columns.

As the 100 column file is how the data is downloaded from our system I do not want to delete any unwanted columns here, this I will do in Query as the future files will include these columns.

After the file is loaded into query, I transform the data and remove the unwanted columns.

Now I discover the future downloaded files (source data) exclude the unwanted columns however it clearly doesn't match what was originally loaded into Power BI. 100 vs 30 columns.

How can I change the way Power BI/Power Query views the file as I want to now upload the new file now containing only 30 columns, not 100.

Thanks

Paul

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March 29, 2023 - 8:40 pm
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It will depend on how you removed the other columns. If you removed them explicitly then you'll just need to edit the query to remove the step that got rid of them. If  you used a Remove other columns approach, then you should be fine anyway as you'll just have a Table.SelectColumns step that only names the columns that still exist (assuming there was no previous type changing step).

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Paul Pritchard
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I have looked in Advanced Editor in query and I selected the columns I wanted and "Removed Other Columns" so there isn't a step that I can see where I actually removed the columns that match those in the source file

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Paul Pritchard
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I've had another look and there is Table.SelectColumns step (see attached)Remove-Colums-Screen-Shot.jpgImage Enlarger

Which step should I remove as the columns listed are the ones I wish to keep

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March 30, 2023 - 6:52 pm
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Remove the #Changed Type step - it refers to all the columns.

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Paul Pritchard
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Thank you, that worked

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