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Re: adding times togeather

From: Alvaro Herrera Munoz <alvherre(at)dcc(dot)uchile(dot)cl>
To: Steve Crawford <scrawford(at)pinpointresearch(dot)com>
Cc: ed despard <despareg(at)clarkson(dot)edu>, pgsql-general(at)postgresql(dot)org
Subject: Re: adding times togeather
Date: 2003-04-28 23:26:24
Message-ID: 20030428232624.GA8833@dcc.uchile.cl (view raw or flat)
Thread:
Lists: pgsql-general
On Mon, Apr 28, 2003 at 02:25:54PM -0800, Steve Crawford wrote:

> You can:
> Subtract two times and get an interval
> Add an interval to a time to get a time

Beware:  you cannot (in 7.2.3 at least -- I don't have 7.3 available for
testing) add a timestamp to an interval and expect a reasonable value.
You have to add the interval to the timestamp.

h=> select '05:04:03'::interval + '2003-mar-01 09:05:00'::timestamp;
      ?column?       
---------------------
 2003-03-01 05:04:03
(1 row)

h=> select '2003-mar-01 09:05:00'::timestamp + '05:04:03'::interval;
        ?column?        
------------------------
 2003-03-01 14:09:03-03
(1 row)

h=> select version();
                                                 version                                                 
---------------------------------------------------------------------------------------------------------
 PostgreSQL 7.2.3 on i686-pc-linux-gnu, compiled by GCC gcc (GCC) 3.2 20020903 (Red Hat Linux 8.0 3.2-7)
(1 row)


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Subject: Bug(?) with cursors using aggregate functions.
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