| From: | Kevin Grittner <kgrittn(at)ymail(dot)com> |
|---|---|
| To: | Daniel Farina <daniel(at)heroku(dot)com>, Maciek Sakrejda <m(dot)sakrejda(at)gmail(dot)com> |
| Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Albe Laurenz <laurenz(dot)albe(at)wien(dot)gv(dot)at>, Tom Duffey *EXTERN* <tduffey(at)trillitech(dot)com>, "pgsql-general(at)postgresql(dot)org" <pgsql-general(at)postgresql(dot)org>, "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: [GENERAL] Floating point error |
| Date: | 2013-03-05 13:59:26 |
| Message-ID: | 1362491966.28424.YahooMailNeo@web162904.mail.bf1.yahoo.com |
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| Lists: | pgsql-general pgsql-hackers |
Daniel Farina <daniel(at)heroku(dot)com> wrote:
> This kind of change may have many practical problems that may
> make it un-pragmatic to alter at this time (considering the
> workaround is to set the extra float digits), but I can't quite
> grasp the rationale for "well, the only program that cares about
> the most precision available is pg_dump". It seems like most
> programs would care just as much.
Something to keep in mind is that when you store 0.01 into a double
precision column, the precise value stored, when written in
decimal, is:
0.01000000000000000020816681711721685132943093776702880859375
Of course, some values can't be precisely written in decimal with
so few digits.
--
Kevin Grittner
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
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