I used QGis to open a shapefile with the rivers in my state (Rio Grande do Sul, Brazil).
I would like to know "the name of every river", but when I click on the rivers, most of the small ones don't have a name. Clicking them one by one would be monotonous, error-prone, and cumbersome.
So, my question is: How can I filter the display of rivers, so that only the ones containing a name would be displayed?
Disclaimer: I have no large experience with GIS concepts. I presume this is a trivial task, but I don't even know where to start figuring out how to do it.