From: | Peter Eisentraut <peter_e(at)gmx(dot)net> |
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To: | pgsql-hackers(at)postgresql(dot)org |
Cc: | "Sergey E(dot) Koposov" <math(at)sai(dot)msu(dot)ru>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
Subject: | Re: Do we need multiple forms of the SQL2003 statistics |
Date: | 2006-07-29 19:07:03 |
Message-ID: | 200607292107.04152.peter_e@gmx.net |
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Lists: | pgsql-hackers |
Sergey E. Koposov wrote:
> I think since we are supporting the numeric type as a special
> high-precision type, Postgres must have the high-precision
> versions of all computational functions. Just my opinion.
Another way to look at it is whether you want to have accurate
computations (numeric) or approximate computations (float). I'm not a
statistician, so I don't know what most of these functions are used
for. From a mathematician's point of view, however, some of these
functions normally produce irrational numbers anyway, so it seems
unlikely that numeric will be useful. But looking at the definition
of, say, regr_avgx(Y, X), if all the input values are integers, it
might be useful if I could get an exact integer or rational number as
output, instead of a float, that is.
--
Peter Eisentraut
http://developer.postgresql.org/~petere/
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