Re: float value is rounded

From: David Fetter <david(at)fetter(dot)org>
To: Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com>
Cc: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: float value is rounded
Date: 2009-11-26 00:32:04
Message-ID: 20091126003204.GA13542@fetter.org
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On Wed, Nov 25, 2009 at 07:46:11PM +0100, Pavel Stehule wrote:
> 2009/11/25 Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>:
> > Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com> writes:
> >> I was surprised with rounding relative not big value. Is it
> >> correct?
> >
> > You do realize float4 has only 6 decimal digits of precision?
> >
>
> To today I though so float4 is more practical :).

Floats have never been safe with respect to operations like =, and
won't become so.

Cheers,
David.
--
David Fetter <david(at)fetter(dot)org> http://fetter.org/
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