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