pg.ddx.io  pgsql-sql@postgresql.org mailing list archive  

help / color / mirror / Atom feed

From: Tom Lane <tgl@sss.pgh.pa.us>
To: chrisj <chrisj.wood@sympatico.ca>
Cc: pgsql-sql@postgresql.org
Subject: Re: Assigning a timestamp without timezone to a timestamp
Date: Tue, 17 Oct 2006 09:34:02 -0400
Message-ID: <16546.1161092042@sss.pgh.pa.us> (raw)
In-Reply-To: <6847852.post@talk.nabble.com>
References: <6613652.post@talk.nabble.com>
	<20061003135623.GB3191@phlogiston.dyndns.org>
	<6621346.post@talk.nabble.com>
	<20061003145134.GA3399@phlogiston.dyndns.org>
	<8C5B026B51B6854CBE88121DBF097A864DE848@ehost010-33.exch010.intermedia.net>
	<20061005183128.GD8826@phlogiston.dyndns.org>
	<6667446.post@talk.nabble.com>
	<20061005203121.GI8826@phlogiston.dyndns.org>
	<6815181.post@talk.nabble.com>
	<13338.1160868392@sss.pgh.pa.us>
	<6827636.post@talk.nabble.com>
	<7622.1160969464@sss.pgh.pa.us>
	<6847852.post@talk.nabble.com>

chrisj <chrisj.wood@sympatico.ca> writes:
> When I first saw your solution I thought it was logically going to do
> (notice the parentheses):
>     select ('2006-07-13 09:20:00'::timestamp) at time zone 'EST5EDT';  
> which does not help

Well, actually, that's exactly what it does.  AT TIME ZONE is an
operator that converts timestamp without time zone to timestamp with
time zone (or vice versa).  I guess you could easily get confused
here, but AT is not WITH.

>   , cast(start_datetime as timestamp(0) without time zone)::timestamp at
> time zone B.timezone_ch

That's redundant --- you're casting the result of the cast to timestamp
(implicitly without time zone), then applying the AT TIME ZONE operator.

			regards, tom lane

view thread (24+ messages)  latest in thread

Message-ID: <16546.1161092042@sss.pgh.pa.us>
Permalink:  ../16546.1161092042@sss.pgh.pa.us/
Also on:    postgresql.org/message-id/16546.1161092042@sss.pgh.pa.us

copy link · copy postgr.es

reply

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Reply to all the recipients using the --to and --cc options:
  reply via email

  To: pgsql-sql@postgresql.org
  Cc: tgl@sss.pgh.pa.us, chrisj.wood@sympatico.ca
  Subject: Re: Assigning a timestamp without timezone to a timestamp
  In-Reply-To: <16546.1161092042@sss.pgh.pa.us>

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

This inbox is served by DDX for PostgreSQL; see mirroring instructions
for how to clone and mirror all data and code used for this inbox