select FullUserName, roomID, count(*) as Cliks from tblStatsPageViews s join v_Users u on s.user_id = u.intUserCn where u.mandator_id = @current_mandator_id and (@StartDate is null or s.requestStartTimeStamp > @StartDate) and (@EndDate is null or s.requestStartTimeStamp < @EndDate) group by user_id, roomID, FullUserName order by FullUserName, roomID