Re: float8 strtod weirdness - Mailing list pgsql-hackers

From David Fetter
Subject Re: float8 strtod weirdness
Date
Msg-id 20090107145744.GC1475@fetter.org
Whole thread Raw
In response to float8 strtod weirdness  ("Nikhil Sontakke" <nikhil.sontakke@enterprisedb.com>)
List pgsql-hackers
On Wed, Jan 07, 2009 at 08:12:44PM +0530, Nikhil Sontakke wrote:
> Hi,
> 
> Consider the following with latest CVS sources:
> 
> postgres=# create table temp(val float4);
> CREATE TABLE
> postgres=# insert into temp values (415.1);
> INSERT 0 1
> postgres=# select * from temp where val = 415.1;
>  val
> -----
> (0 rows)
> 
> !?

No "!?" at all.  The "=" operation on floats has never been one to
count on.  If you need "=" not to give "surprising" results, you need
to use some other data type such as numeric.

Cheers,
David.
-- 
David Fetter <david@fetter.org> http://fetter.org/
Phone: +1 415 235 3778  AIM: dfetter666  Yahoo!: dfetter
Skype: davidfetter      XMPP: david.fetter@gmail.com

Remember to vote!
Consider donating to Postgres: http://www.postgresql.org/about/donate


pgsql-hackers by date:

Previous
From: "Nikhil Sontakke"
Date:
Subject: float8 strtod weirdness
Next
From: Tom Lane
Date:
Subject: Re: float8 strtod weirdness