Thanks Todd, that's what I needed:
...
case when exists
(select 1 from users_files uf
where uf.owner_id = u.user_id
and uf.file_size > 0)
then '*'
else ' '
end as file_owner
...
For those lurking, I added the
uf.file_size > 0
so that it would only star for users with files.
This code was added to the select in /homepage/all.tcl
And Thanks Dan, I did notice that this is slower to show so
it will be great when it's optimized.
-Bob