Re: Add quto increment to existing column

If you use the SERIAL (this is the auto-incrementing function that creates
sequences in the bankground for you) datatype you can accomplish it in one
go.

So:
DROP sequence hist_id_seq; -- Get rid of your old sequence

ALTER TABLE my_table DROP COLUMN hist_id; -- Remove id column

ALTER TABLE my_table ADD COLUMN hist_id SERIAL PRIMARY KEY; -- Recreate it
as Primary Key and quto-incrementing.

Btw: have you tried the http://www.pgadmin.org/ pgadmin gui for
postgres? It will help you do tasks like this and show you the SQL to do it
on the command line :)

Cheers,
Marc

Robert Buckley wrote:
>
> Hi,
>
> I have a column in a table called hist_id with the datatype "integer".
> When I created the table I assigned this column the primary key constraint
> but didn´t make it an auto-increment column.
>
> How could I do this to an the already existing column?
>
> I have created the sequence with the following command but don´t know how
> to change the existing column to auto-increment.
>
>
> $ create sequence hist_id_seq;
>
> thanks for any help,
>
> Rob
>

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