Re: How many digits are printed with double precision? - Mailing list 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.dubois@limsi.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
>