From: | Zachary Beane <xach(at)xach(dot)com> |
---|---|
To: | George Johnson <gjohnson(at)jdsc(dot)com> |
Cc: | pgsql-general(at)postgresql(dot)org |
Subject: | Re: MySQL-esque sec_to_time() function |
Date: | 2000-12-06 16:43:33 |
Message-ID: | 20001206114333.C14297@xach.com |
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Thread: | |
Lists: | pgsql-general |
On Wed, Dec 06, 2000 at 08:27:56AM -0800, George Johnson wrote:
> Hello,
>
> I'm converting from MySQL to PostgreSQL (actually flipping/flopping
> back) and have a question:
>
> MySQL has a cool function sec_to_time() which converts your number
> of seconds to hh:mm:ss
>
> I've read thru the mailing lists and am basically trying to
> implement the following:
>
> MySQL:
> select sec_to_time(sum(unix_timestamp(enddate) - unix_timestamp(startdate))) from foo;
>
> PostgreSQL:
> select XXX(sum(date_part('epoch',enddate) - date_part('epoch',startdate))) from foo;
>
> I just need to know what XXX is/can be. I've tried a lot of
> combinations of the documented functions and come up with useless
> conversions.
You could implement sec_to_time as a SQL function:
create function sec_to_time(int4)
returns text
as '
select(to_char(''today''::timestamp + interval($1), ''HH24:MI:SS''))
' language 'sql';
However, this function would be limited to time spans of 24 hours.
Zach
--
xach(at)xach(dot)com Zachary Beane http://www.xach.com/
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