Re: generate_series with month intervals

Marcus Engene <mengpg@engene.se> writes:
> I tried this but it didn't work:

> select date_trunc ('month', now())::date + interval s.a || ' months'
> from generate_series(0, 11) as s(a)

People keep trying that :-(.  The "typename 'foo'" syntax is for a
*literal constant* only.  Instead use multiplication, something like

select (date_trunc('month', now())::date + s.a * '1 month'::interval)::date
from generate_series(0, 11) as s(a)

You'll want the cast back to date as the last step here because
date+interval will give timestamp.

            regards, tom lane