puoi dichiarare una variabile in cui salverai l'ultima data. puoi usarlo nella prossima iterazione.
declare
v_last_date date; -- is null
...
begin
...
for i in t_data.first .. t_data.last loop
if v_last_date is null then
dbms_output.put_line(to_char(t_data(i).englishcalendar,'dd-mm-yyyy')||' 0' );
else
dbms_output.put_line(to_char(t_data(i).englishcalendar,'dd-mm-yyyy')||' '
||to_char(t_data(i).englishcalendar - v_last_date)
||' [' ||to_char(t_data(i).englishcalendar,'dd-mm-yyyy')||'-'
|| to_char(v_last_date ,'dd-mm-yyyy')||']' );
end if;
v_last_date := t_data(i).englishcalendar; -- save a date of the iteration
end loop;
end;
non l'ho testato.
