Re: Assigning a timestamp without timezone to a timestamp - Mailing list pgsql-sql

Hi Hector,

It would probably better to get the explanation from Andrew, but I will do
the best I can.

You asked about the 1 and -3.  The 1 would be the store number in my
original scenario and -3 would be the representation of the timezone (three
hours behind Universal Coordinate Time).

I still have not had a chance to implement the solution into my application,
but I am assuming the -3 could also be a mnemonic such as "EDT"  I live in
Toronto EDT is Eastern Daylight-savings Time.

As for the syntax of the select, it is simply casting a character
representation of a timestamp concatenated with a character representation
of timezone to timestamptz.

In hindsight it is so simple I can't believe I could not come up with it
myself. 


Hector Villarreal wrote:
> 
> Hi 
> I am also interested in this type of setup. However, in the example
> below
> I am a little confused as to why the table entry is 1, -3 
> And the subsequent select statement . I would appreciate an explanation
> on the select statement. I do not understand the syntax. 
> Thanks in advance 
> Hector Villarreal
> SELECT a.timestamp::timestamptz from (SELECT '2006-10-03
> 09:00'||"timezone" as timestamp from storetz where id = 1) as a;
>        timestamp        
> 
> -----Original Message-----
> From: pgsql-sql-owner@postgresql.org
> [mailto:pgsql-sql-owner@postgresql.org] On Behalf Of Andrew Sullivan
> Sent: Tuesday, October 03, 2006 7:52 AM
> To: chrisj
> Cc: pgsql-sql@postgresql.org
> Subject: Re: [SQL] Assigning a timestamp without timezone to a timestamp
> 
> On Tue, Oct 03, 2006 at 07:26:52AM -0700, chrisj wrote:
>> location, but they are the directive to all store locations saying:
> "In the
>> context of the timezone your store is located in,  these are the hours
> you
>> should be open.
> 
> Ah.  Well, then, right, it _does_ have to be timezone free.  That's
> actually the only case I'd use that.  Sorry, I'm dim, and didn't
> understand properly what you were doing.  (I read the "relative to
> the store's own time zone" to refer to the corporate office.  No, I
> don't know why, either.  Told you I'm dim.)
> 
> Anyway, here's something that worked for me (expanding this into your
> case ought not to be too tricky):
> 
> testing=# SELECT * from storetz ;
>  id | timezone 
> ----+----------
>   1 | -03
> (1 row)
> 
> testing=# SELECT a.timestamp::timestamptz from (SELECT '2006-10-03
> 09:00'||"timezone" as timestamp from storetz where id = 1) as a;
>        timestamp        
> ------------------------
>  2006-10-03 12:00:00+00
> (1 row)
> 
> A
> -- 
> Andrew Sullivan  | ajs@crankycanuck.ca
> When my information changes, I alter my conclusions.  What do you do
> sir?
>         --attr. John Maynard Keynes
> 
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