Re: Creating a new column with SERIAL as data type

Thank you very much Mr. Lane.
It worked.
Would you mind explaining the code that you sent.
I would appreciate and curious to learn in fact the
meaning of the pg/pl sql statements.
thank you.
Kumar.

--- Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:

> Kumar S <ps_postgres(at)yahoo(dot)com> writes:
> > friends=> alter table friend add column fr_id
> serial;
> > NOTICE: ALTER TABLE will create implicit sequence
> "friend_fr_id_seq" for "serial" column
> "friend.fr_id"
> > ERROR: adding columns with defaults is not
> implemented
> > HINT: Add the column, then use ALTER TABLE SET
> DEFAULT.
>
> > Can any one suggest what is wrong here.
>
> Just what it says: adding columns with defaults is
> not implemented.
> (It is implemented in 8.0, but that won't help you
> today.) You can
> do it by hand:
>
> create sequence friend_fr_id_seq;
> alter table friend add column fr_id int;
> update friend set fr_id =
> nextval('friend_fr_id_seq');
> alter table friend alter column fr_id set default
> nextval('friend_fr_id_seq');
>
> This isn't an exact substitute since the sequence
> will appear as
> a standalone object and not be hidden behind the
> "serial" column,
> but it's functionally equivalent.
>
> regards, tom lane
>
> ---------------------------(end of
> broadcast)---------------------------
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> settings
>

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