oracle8.1.6 select to_char(start_date, :ansi_date_format) as ansi_start_date, to_char(end_date, :ansi_date_format) as ansi_end_date, nvl(e.name, a.name) as name, nvl(e.description, a.description) as description, nvl(e.status_summary, a.status_summary) as status_summary, e.event_id as item_id, cals.calendar_id, cals.calendar_name from acs_activities a, acs_events e, timespans s, time_intervals t, cal_items ci, calendars cals where e.timespan_id = s.timespan_id and s.interval_id = t.interval_id and e.activity_id = a.activity_id and start_date between to_date(:first_date_of_month_system, :ansi_date_format) and to_date(:last_date_in_month_system, :ansi_date_format) and cals.calendar_id = ci.on_which_calendar and e.event_id = ci.cal_item_id $calendars_clause order by ansi_start_date, ansi_end_date