From: Kenneth Marshall <ktm@rice.edu>
To: Gavin McCullagh <gavin.mccullagh@gcd.ie>
Cc: pgsql-sql@postgresql.org
Subject: Re: extracting from epoch values in pgsql
Date: Thu, 17 Sep 2009 12:39:59 -0500
Message-ID: <20090917173959.GE22802@it.is.rice.edu> (raw)
In-Reply-To: <20090917173439.GW16815@gcd.ie>
References: <20090917164439.GU16815@gcd.ie>
<4AB26B6F.4010207@sympatico.ca>
<20090917173039.GV16815@gcd.ie>
<20090917173439.GW16815@gcd.ie>
On Thu, Sep 17, 2009 at 06:34:39PM +0100, Gavin McCullagh wrote:
> On Thu, 17 Sep 2009, Gavin McCullagh wrote:
>
> > On Thu, 17 Sep 2009, Frank Bax wrote:
> >
> > > Gavin McCullagh wrote:
> > >> SELECT time, to_timestamp(time) AS ts,
> > >> EXTRACT('months',to_timestamp(time)) FROM mdl_log;
> > >> ERROR: syntax error at or near ","
> > >> LINE 1: ...t time, to_timestamp(time) AS ts, extract('months',to_times...
> > >
> > > Try replacing extract('month',value) with extract('months' from value)
> >
> > Makes no difference whether month or months:
>
> Actually, I pasted a different query, but based on the one in my last
> email:
>
> moodle-01-01-2009=# SELECT EXTRACT('months',(TIMESTAMP WITH TIME ZONE 'epoch' + mdl_log.time * INTERVAL '1 second'))
> FROM mdl_log;
> ERROR: syntax error at or near ","
> LINE 1: SELECT EXTRACT('months',(TIMESTAMP WITH TIME ZONE 'epoch' + ...
> ^
> moodle-01-01-2009=# SELECT EXTRACT('month',(TIMESTAMP WITH TIME ZONE 'epoch' + mdl_log.time * INTERVAL '1 second'))
> FROM mdl_log;
> ERROR: syntax error at or near ","
> LINE 1: SELECT EXTRACT('month',(TIMESTAMP WITH TIME ZONE 'epoch' + m...
> ^
>
> Gavin
>
Gavin,
I think Frank had the answer:
Try replacing extract('month',value) with extract('months' from value)
Look at the documentation for the syntax for further details.
Regards,
Ken
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To: pgsql-sql@postgresql.org
Cc: ktm@rice.edu, gavin.mccullagh@gcd.ie
Subject: Re: extracting from epoch values in pgsql
In-Reply-To: <20090917173959.GE22802@it.is.rice.edu>
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