Generate list with 30 step

Question

Hi,
my need is to generate lis with 30 step,
for example:
id
30
60
90
120
how do I perform this?
Thanks ahead.

Answer 1

You can also generate rows using recursive subquery factoring...but CONNECT BY is ofcourse much more intuitive.
$> var max_n number
$> exec :max_n := 150
PL/SQL procedure successfully completed.
$> with list(n) as ( select 30 n from dual union all
  2                    select n+30 from list where n+30 <= :max_n
  3                  )
  4  select n
  5  from   list;
         N
        30
        60
        90
       120
       150
5 rows selected.
$>  exec :max_n := 300
PL/SQL procedure successfully completed.
$> with list(n) as ( select 30 n from dual union all
  2                      select n+30 from list where n+30 <= :max_n
  3                    )
  4    select n
  5    from   list;
         N
        30
        60
        90
       120
       150
       180
       210
       240
       270
       300
10 rows selected.