title: Additional section in UITableView with NSFetchedResultsController
body: <p>I am currently implementing a UITableViewController with an NSFetchedResultsController. It fetches some objects from CoreData and displays them as rows in one section as expected. </p>
  
  <p>Now, I would like to have one additional section with exactly one row that displays aggregated information about the fetched objects. </p>
  
  <p>From what I know, one NSFetchedResultsController can only have one fetch request, but I would have to use another one to get the aggregated information. </p>
  
  <p>Perhaps I should use one NSFetchedResultsController for the Overall section and another one for the single object section, but this feels kind of strange to me. </p>
  
  <p>What do you think?</p>