How to display output in Pl/SQL

Question

I was wondering if someone can help me figure out how to code so that it will display the output without me having to use the command select * from month_days when I run the program.

set serveroutput on

--- Drop Table
DROP TABLE MONTH_DAYS;
--- Create Table 
CREATE TABLE MONTH_DAYS(cnt number(2), Month_ Varchar(9),Days_ Number(2));

Declare
mons varchar2(10);
dats varchar2(10);
i Binary_integer := 0;

Begin
loop
i:= i+1;
if i = 13 then
exit;
end if;
insert into month_days(cnt, month_, days_)`enter code here`
values
(i, to_char(add_months(to_date('20200112', 'YYYYDDMM'), i), 'Month'),
to_char(last_day(add_months(to_date('20200112', 'YYYYDDMM'), i)), 'DD'));
end loop;
DBMS_Output.Put_Line('The Month and Days for the year 2020'||Month_|| ''||Days_);
end;

Answer 1

Create or Replace function insert_date (mons varchar2, dats varchar2)
return varchar2
as
i Binary_integer := 0;
Begin
loop
i:= i+1;
if i = 13 then
exit;
end if;
insert into month_days(cnt, month_, days_)
//enter code here Didn't understood what you are trying to do here
values
(i, to_char(add_months(to_date('20200112', 'YYYYDDMM'), i), 'Month'), to_char(last_day(add_months(to_date('20200112', 'YYYYDDMM'), i)), 'DD'));
end loop;
return 'The Month and Days for the year 2020'||Month_|| ''||Days_;
end;
select insert_date(12,2) from dual;

Is this what you are looking for ??

I haven't tested this. I think it should work.

Answer 2

Use:

select
  rownum cnt,
  to_char(add_months(date '2020-12-01', rownum), 'Month') month_,
  to_char(last_day(add_months(date '2020-12-01', rownum)), 'DD')) days_
from
  dual
connect by
  level <= 12;

Answer 3

If you're using sqlplus, try turning serveroutput on by using the following command.

set serveroutput on

if using another client program, look up the documentation for enabling server output.