In PG 7, you can add column like:
create table test (c1 varchar(30));
alter table test add column c2 int;
select version();
version
-------------------------------------------------------------
PostgreSQL 7.3.2 on i686-pc-linux-gnu, compiled by GCC 2.96
(1 row)
I do not know you can alter field/column length in PG 8 and it can be
done in PG 8:
select version();
version
------------------------------------------------------------------------
----------------------------------
PostgreSQL 8.0.3 on i686-pc-linux-gnu, compiled by GCC gcc (GCC) 3.2.3
20030502 (Red Hat Linux 3.2.3-49)
(1 row)
alter table test alter c1 type varchar(50);
I think in PG, you can:
1. add a new right length column like shown
2. update test set new_column=old_column;
3. alter table drop old_column
-----Original Message-----
From: pgsql-admin-owner@xxxxxxxxxxxxxx
[mailto:pgsql-admin-owner@xxxxxxxxxxxxxx] On Behalf Of Chuming Chen
Sent: Tuesday, June 28, 2005 8:40 AM
To: Peter Eisentraut
Cc: pgsql-admin@xxxxxxxxxxxxxx
Subject: Re: [ADMIN] change existing table definition
Peter Eisentraut wrote:
>Chuming Chen wrote:
>
>
>>How can I change the column definition of an existing table, ie. from
>>varchar(30) to varchar(50)? Is there any way to add a new column to
>>an existing table?
>>
>>
>
>The ALTER TABLE command can do all that. You need version 8.0 or later
>for some functionality though.
>
>
>
Is there another way to do it in 7.* ?
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