Direct Querying Issues

Thank you for the reply. I attahced a description that could help to find a solution for me. 

I am in direct querying and my data source is Sql Server. What I do is the following:

- I connect to the server and select two tables.
- With direct querying I select just some rows of the two table and push "close and apply".

- I open a query window (push "edit query") and merge the two table with a left join. This is done in a new query.

- I push "close and apply".
- I get an errore saying that I can not mix direct querying and importing.

My goal is the following: open two table, selct the columns I want and join the two tables. Afterwards I would like to export to the main window (the one you see on the background in my screenshot) in order to chart it.

Thank you again. I hope you can help me. I am querying directly because otherwise is really slow.