composite type in a table

is there any way to use a composite type in a table?

here's an example:

say i want to create a type to hold currency:

create type currency_type as ( base_objid int, base_amt decimal,
conversion_rate decimal, converted_objid int );

i'd like to be able to define a column in a table of type currency_type:

create table currency_table ( myMoney currency_type );

unfortunately, i get:

ERROR: Attribute "mymoney" has composite type currency_type

it sure would be nice if it was as simple as this, but it isn't. what's the
easiest way to create a composite-like type that can be added to a table?

also, how does one access the internal fields of a composite type?

Regards,

Floyd Shackelford
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