JOIN-alternatives in attribute view for what?

I am trying to understand the JOIN-types for an attribute view and I am using the following tables:

I have set up a simple attribute view like this:

In term of JOINs I have tried the following:

All the above alternatives delivers EXACTLY the same output:

Is this a bug (or a feature) in my system?

I would have expected different JOINs to deliver different results.

What specifically I am looking for in this case is:

I would really appreciate that somebody explains this. Thank you :-)