what could be a sql query for if a service company provided service to 19 original territories earlier + 2 additional that were changed at one pricing , then 9 new territories that were charged at a different pricing , and in enrolling the last territory this year . for the 31 territories that are present in the file, which ones were part of the original 19, the 2 additional and the new 9 territories , and the last one that is enrolling now?