"David G. Johnston" <david.g.johnston@gmail.com> writes:
> On Sat, Aug 31, 2019 at 7:05 AM stan <stanb@panix.com> wrote:
>> CURRENT_DATE) - interval ' $1
>> month - 1
>> ' day as date)
> ($1 || ' month')::interval -- should work
FWIW, I tend to prefer doing it with interval arithmetic, like this:
$1 * '1 month'::interval - '1 day'::interval
It's faster (not enormously so, but measurably) thanks to not having
to construct and then parse a text string. To my mind it's easier
to reason about, too, and a bit safer.
regards, tom lane