From: | Marti Raudsepp <marti(at)juffo(dot)org> |
---|---|
To: | Thom Brown <thom(at)linux(dot)com> |
Cc: | Robert Haas <robertmhaas(at)gmail(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: Determining period between 2 dates |
Date: | 2011-02-16 17:07:13 |
Message-ID: | AANLkTi=c4VB38DkyiC4VQfA9Ak+Gyy+EJNOe1eHjOFg-@mail.gmail.com |
Views: | Raw Message | Whole Thread | Download mbox | Resend email |
Thread: | |
Lists: | pgsql-hackers |
On Wed, Feb 16, 2011 at 18:03, Thom Brown <thom(at)linux(dot)com> wrote:
> For the number of fortnights, that becomes:
>
> select extract(epoch from now() - '2010-01-01 11:45:13'::timestamp)/60/60/24/14;
>
> You'd think with PostgreSQL having such a rich type system, it
> wouldn't need to come to that. It's just asking for the number of
> intervals between 2 timestamps rather than the number of seconds and
> dividing it to the point you get your answer.
I think a good generic solution would be an interval/interval operator
that returns numeric. Then the above becomes:
SELECT (now() - timestamp '2010-01-01 11:45:13') / interval '2 weeks';
However, looking at the code, it's not so obvious what to do if the
intervals contain months.
Regards,
Marti
From | Date | Subject | |
---|---|---|---|
Next Message | Alvaro Herrera | 2011-02-16 17:08:02 | pgsql: Cleanup ClusterInfo initialization in pg_upgrade |
Previous Message | Kevin Grittner | 2011-02-16 16:36:16 | Re: Determining period between 2 dates |