It makes sense when ya'll explain it
It never sounds that good when I'm talkin to myself
That solves my problem but not my ignorance
I'm still curious about how would I properly quote
create or replace function test(integer) returns setof text as $$
declare a record;
begin select into a now() - interval '$1 day'; return next a; return;
end
$$ language 'plpgsql';
I got the usage example for interval from
http://www.postgresql.org/docs/8.1/interactive/functions-datetime.html
Thanks
Richard
On Tue, 19 Dec 2006, Tom Lane wrote:
> "Hector Villarreal" <HVillarreal@mynewplace.com> writes:
>> select into a now() - ($1::text||'days')::interval;
>
> People keep suggesting variants of that as ways to convert numeric
> values to intervals, but it's really extremely bad practice. Much
> better is to use number-times-interval multiplication:
>
> select into a now() - $1 * '1 day'::interval;
>
> This is less typing, at least as easy to understand, more flexible
> (you can use any scale factor you want), and considerably more
> efficient. The first way involves coercing the integer to text,
> then text-concatenating that with a constant, then applying
> interval_in which does a fairly nontrivial parsing process.
> The second way is basically just a multiplication, because
> '1 day'::interval is already a constant value of type interval.
>
> regards, tom lane
>
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