SQL query on number of items in subfolders in SEV

Hi,

I've got a user who has hundreds of subfolders of a particular folder in their vault. I've looked at SQL and can't see an obvious way of reporting on these sub folders and the number of items in them. I can report on the folders by using ArchiveFolderView and the  ArchiveVEID and  ParentFolderRootIdentity values.

How do I report on the number of items in these subfolders?

Thanks in advance