select only default

Hi all,

just for curiosity:

Is it possible to SELECT a row that consists only of default values of a
table ?

Let's suppose I have a Table:

CREATE TEMP TABLE tempo
(
a int DEFAULT 5,
b text DEFAULT 'five'
);

I want as a result:

(5, 'five')

But without inserting a row.

Is this possible with 1 query ?

I thought of something like OUTER JOINS where you get defaults for
non-existing rows, too.

What I need this for ?
I want to present users a form for inserting new rows. The form should
be loaded with default values.

Of course I can do it without SQL, but I thought, hey, that'd be cool in
plain SQL.

BTW: The DEFAULT values are all 'simple' types, no serials etc. included

TIA
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