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Re: BUG #3959: Huge calculation error

From: "Heikki Linnakangas" <heikki(at)enterprisedb(dot)com>
To: "Renaud Diez" <rdiez(at)salesprize(dot)com>
Cc: <pgsql-bugs(at)postgresql(dot)org>
Subject: Re: BUG #3959: Huge calculation error
Date: 2008-02-13 11:24:49
Message-ID: 47B2D381.1010304@enterprisedb.com (view raw or flat)
Thread:
Lists: pgsql-bugs
Renaud Diez wrote:
> The following bug has been logged online:
> 
> Bug reference:      3959
> Logged by:          Renaud Diez
> Email address:      rdiez(at)salesprize(dot)com
> PostgreSQL version: 8.2
> Operating system:   Debian
> Description:        Huge calculation error
> Details: 
> 
> the basic mathematical expression like the following one doesn't compute the
> correct result:
> 
>> select 100*(1+(21/100));
> 
> return a result of 100 instead of 121.

That's because 21/100 = 0, in integer math. Try "SELECT 
100*(1+(21/100.0))" to use floating points.

-- 
   Heikki Linnakangas
   EnterpriseDB   http://www.enterprisedb.com

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