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Re: How many digits are printed with double precision?

From: Mathieu Dubois <mathieu(dot)dubois(at)limsi(dot)fr>
To: pgsql-novice(at)postgresql(dot)org
Subject: Re: How many digits are printed with double precision?
Date: 2011-03-23 21:24:22
Message-ID: 4D8A6506.70203@limsi.fr (view raw or flat)
Thread:
Lists: pgsql-novice
Hi Tom,

Thanks for the very fast answer but what do you mean exactly by :

"See extra_float_digits."

I have found messages on the mailing list but it doesn't help (I don't 
want to recompile everything). Is there an option in some configuration 
file to set?

Mathieu
On 03/23/2011 10:02 PM, Tom Lane wrote:
> Mathieu Dubois<mathieu(dot)dubois(at)limsi(dot)fr>  writes:
>> I have a double precision column in my DB (it's the time at which an
>> image was taken expressed in second from UNIX epoch). When I query the
>> value (SELECT time...) I get only 5 digits after the dot (while I
>> /suppose/ there are 6 digits). I have the same result when using
>> pgadmin. The results looks like the rounding of the desired time (which
>> I know by the filename).
> See extra_float_digits.  Be aware that cranking that up produces digits
> that are not 100% trustworthy.  If you are expecting exact results of
> more than 15 places, you likely shouldn't be using float arithmetic.
>
> 			regards, tom lane
>


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