Removed rows not actually removed

[Anonymous]

Hi there everybody,

I'm new to PowerBI but getting the hang of it. However, there's a reasonable amount of peculiarities that make me feel like I'm taking crazy pills. My current problem: I'm importing all CSV files from a specific folder. Each file unfortunately has a useless 1st row that I remove in the query, but still shows up in the data! I've attached a screenshot with the data and data query. Circled in red are the steps that 1) remove the 1st row and 2) set the new top row as headers. The Data view clearly shows those first rows despite them being removed in the query. Am I misunderstanding something or missing a step?

[Anonymous]

Hi @Anonymous,

I think you should turn on the last steps and click on apply the change. It seems like you finish added your custom steps but you are navigate to the previous history steps.

>>The Data view clearly shows those first rows despite them being removed in the query. Am I misunderstanding something or missing a step?

Power query will log operate steps, it not support to modify the original data source. On this basics, you can simply view your previous data of specific steps.

Regards,

Xiaoxin Sheng

[Anonymous]

Hi @Anonymous,

I did turn on those steps and applied the changes, I clicked back through the steps to show for my post what wasn't happening.

[MarcelBeug · Accepted solution]

When you remove top rows and promote headers in the main query, that applies only once for the combined data, not for each individual file.

If you want to perform transformations for each individual file, you should adjust the Transform Sample File query, instead of the main query.

The code in the Transform Sample File query, is directly linked to the function that is applied to all files.