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From: David Stanaway <david@stanaway.net>
To: pgsql-sql@postgresql.org
Subject: Re: Math Huh?
Date: 30 May 2002 18:48:47 -0500
Message-ID: <1022802527.25795.7.camel@ciderbox> (raw)
In-Reply-To: <200205301629.26161.josh@agliodbs.com>
References: <200205301629.26161.josh@agliodbs.com>

On Thu, 2002-05-30 at 18:29, Josh Berkus wrote:
> Folks,
> 
> I'll let this session speak for itself:
> 
> jwnet=> select version();
>                             version
> ---------------------------------------------------------------
>  PostgreSQL 7.2.1 on i686-pc-linux-gnu, compiled by GCC 2.95.3
> (1 row)
> 
> jwnet=> select (255 * 255 * 255 * 255);
>  ?column?
> -----------
>  -66716671
> (1 row)
scratch=# select (255 * 255 * 255 * 255::int8);
  ?column?  
------------
 4228250625
(1 row)

$ bc -l
obase=16
4228250625
FC05FC01
^

You have overflowed a signed integer as the most significant bit is set.

--
David Stanaway

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