Select distinct
trunc(sessions.starttime) as date,
comp.name,
comp.HC,
sessions.ctype,
count (sessions.userid)
from
S_USERSESSION sessions,
S_USER users,
S_COMPANY comp
where
sessions.userid = users.userid and
users.companyid = comp.companyid and
sessions.starttime > trunc(sysdate) - 10 AND...