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Re: New version of money type

From: David Fetter <david(at)fetter(dot)org>
To: Xiaofeng Zhao <xf10036(at)hotmail(dot)com>
Cc: tomas(at)tuxteam(dot)de, Martijn van Oosterhout <kleptog(at)svana(dot)org>,"Jim C(dot) Nasby" <jim(at)nasby(dot)net>,"D'Arcy J(dot)M(dot) Cain" <darcy(at)druid(dot)net>, llonergan(at)greenplum(dot)com,sfrost(at)snowman(dot)net, pgsql-hackers(at)postgreSQL(dot)org
Subject: Re: New version of money type
Date: 2006-09-30 15:57:04
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-hackers
On Sat, Sep 30, 2006 at 11:36:04AM -0400, Xiaofeng Zhao wrote:
> >I feel silly for even mentioning this, but there are less than 256
> >countries in the UN, and as far as I know, each has at most one
> >currency, so you could use 8 bits instead of 15.
> >
> That's not always true, e.g. China has RMB and HKD.  Also Taiwan is
> not a member country of UN but I don't think one would exclude TWD.

Right.  There are several countries whose currency is USD, so I still
contend that at any given instant, there are fewer than 256
currencies, so we're back to 8 bits.

> There'll also times a country may transit from one currency to
> another.  Even a currency (currency of most continental European
> countries before Euro) is no more being used, it may still need to
> be supported.

The "money" type is far too simplistic to model this kind of thing.  A
really sophisticated representation of money would have to take time,
inflation/deflation, pairwise exchange rates, etc. into account.  It
would look more like a schema with a large data set and a large body
of code loaded into it than it would a data type.

David Fetter <david(at)fetter(dot)org>
phone: +1 415 235 3778        AIM: dfetter666
                              Skype: davidfetter

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