more-than-one-SERIAL column per table

On Sun, May 06, 2001 at 02:59:31AM +0200, Morten Primdahl wrote:
> > \d tbl_c_id_seq
> >
> > if it is not there, you can create it yourself
>
> Thanks, the sequence was not there. Just puzzled me that
> when creating tbl_c, I get:
>
> test=# CREATE TABLE tbl_c
> (id SERIAL PRIMARY KEY,
> data VARCHAR(50),
> a SERIAL CONSTRAINT a_ref REFERENCES tbl_a(id),
> b SERIAL CONSTRAINT b_ref REFERENCES tbl_b(id)
> );

is there any paradigm wherein TWO serial values for one table
might possible be useful? (since serial is really "int default
nextval('sequence_seq')" how can the second serial be anything
but redundant?)

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