postgresql7.1 where now()-o.confirmed_date <= timespan_days(1) where now()-o.confirmed_date <= timespan_days(7) where now()-o.confirmed_date <= '1 month'::interval where true select o.order_id, o.confirmed_date, o.order_state, ec_total_price(o.order_id) as price_to_display, o.user_id, u.first_names, u.last_name, count(*) as n_items from ec_orders o join ec_items i using (order_id) left join cc_users u on (o.user_id=u.user_id) $confirmed_query_bit $order_state_query_bit group by o.order_id, o.confirmed_date, o.order_state, ec_total_price(o.order_id), o.user_id, u.first_names, u.last_name order by $order_by_clause