Thank you for your post.
I just want to clarify what you are trying to do so I can make sure that I can provide the right information.
1. You have a file that contains Attributes for “highway” and “tunnel”
2. You want to select all Attributes that exist in the “highway” column and all attributes that have “yes” in the “tunnel” column
Is that correct? This isn’t the right statement, but you are looking for something like SELECT * FROM HIGHWAY AND WHERE TUNNEL = “yes”. That sort of thing?
Let me know and I will be able to help.