Hi, I'm new to all this and I find it fascinating!!!
I need help to understand something I want to do but I don't know how...
For sure is a very easy thing...
I have 12 CVS files, monthly sales, each one is a month and I want to make a new table called year_2020. In that table, I want to put all the months together.
I don't know how to make a join but they don't share a second key. I don't want to join the information I want all the information in one table if that's passible?