[Beginner Question] Calculated column

Hi,

I am new to Power BI (Started an hour ago) and am learning the ropes.

I would like to add a new calculated column in my report - when I do this will it create that column in the database I am connected to via direct query mode?

I just want the column to be available in my Power BI report and not be written to the database I am querying.

Thanks

Jonno