Join several external queries to an existing table.

[Gringoire]

Hello friends,
I have a question that is probably a common one but I didn't found a clear answer with Google, also because I'm weak in query management.

I have an excel file with several queries coming from external sources.
How can I merge all the queries results in a single table?

I do not necessarily need a step by step procedure; even a code snippet or some hints about how to proceed would be appreciated.

thank you in advance.