I am working on the analysis of the Stack Overflow dump. I met some questions when I worked on the posts.xml file.
Do all the questions in the dump have accepted answers? If they are expected to have them, then why do some questions not have accepted answer IDs? Or even no OwnerID?
On Stack Overflow, if one question is not answered, does it mean it will be deleted or closed? How long can one question exist if it never has an accepted answer?