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* adding column with not null constraint
@ 2002-10-18 20:12 Vivek Khera <khera@kcilink.com>
2002-10-18 21:57 ` Re: adding column with not null constraint mallah@trade-india.com
2002-10-20 15:26 ` Re: adding column with not null constraint Johannes Lochmann <johannes.lochmann@chello.at>
0 siblings, 2 replies; 3+ messages in thread
From: Vivek Khera @ 2002-10-18 20:12 UTC (permalink / raw)
To: pgsql-sql
I'm looking to add a column to my database with not null and a default
value:
vk=> alter table msg_owner add column user_optional_fields varchar(255) NOT NULL default '';
ERROR: Adding columns with defaults is not implemented.
Add the column, then use ALTER TABLE SET DEFAULT.
vk=> alter table msg_owner add column user_optional_fields varchar(255) NOT NULL ;
ERROR: Adding NOT NULL columns is not implemented.
Add the column, then use ALTER TABLE ADD CONSTRAINT.
Ok, so we can succeed with this:
ALTER TABLE msg_owner ADD COLUMN user_optional_fields VARCHAR(255);
ALTER TABLE msg_owner ALTER user_optional_fields SET DEFAULT '';
UPDATE msg_owner SET user_optional_fields = '';
Now my problem is I cannot find any syntax for ALTER TABLE ADD
CONSTRAINT to put a NOT NULL constraint on a column. Can someone help
me here?
I'm using Postgres 7.2.1 on FreeBSD 4.6.
Thanks.
--
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
Vivek Khera, Ph.D. Khera Communications, Inc.
Internet: khera@kciLink.com Rockville, MD +1-240-453-8497
AIM: vivekkhera Y!: vivek_khera http://www.khera.org/~vivek/
^ permalink raw reply [nested|flat] 3+ messages in thread
* Re: adding column with not null constraint
2002-10-18 20:12 adding column with not null constraint Vivek Khera <khera@kcilink.com>
@ 2002-10-18 21:57 ` mallah@trade-india.com
1 sibling, 0 replies; 3+ messages in thread
From: mallah@trade-india.com @ 2002-10-18 21:57 UTC (permalink / raw)
To: khera@kcilink.com; +Cc: pgsql-sql
Hi Vivek,
In 7.3 there will be a fully implemented ALTER TABLE command for making
columns null or not null.
Currently you can update 'attnotnull' of pg_attribute system catalog
for the attrelid and attname. use pg_class system catalog for getting
attrelid of a given relation.
Regds
MAllah.
> I'm looking to add a column to my database with not null and a default value:
>
> vk=> alter table msg_owner add column user_optional_fields varchar(255) NOT NULL default '';
> ERROR: Adding columns with defaults is not implemented.
> Add the column, then use ALTER TABLE SET DEFAULT.
> vk=> alter table msg_owner add column user_optional_fields varchar(255) NOT NULL ; ERROR:
> Adding NOT NULL columns is not implemented.
> Add the column, then use ALTER TABLE ADD CONSTRAINT.
>
> Ok, so we can succeed with this:
>
> ALTER TABLE msg_owner ADD COLUMN user_optional_fields VARCHAR(255); ALTER TABLE msg_owner ALTER
> user_optional_fields SET DEFAULT '';
> UPDATE msg_owner SET user_optional_fields = '';
>
> Now my problem is I cannot find any syntax for ALTER TABLE ADD
> CONSTRAINT to put a NOT NULL constraint on a column. Can someone help me here?
>
> I'm using Postgres 7.2.1 on FreeBSD 4.6.
>
> Thanks.
>
> --
> =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= Vivek Khera, Ph.D.
> Khera Communications, Inc.
> Internet: khera@kciLink.com Rockville, MD +1-240-453-8497 AIM: vivekkhera Y!:
> vivek_khera http://www.khera.org/~vivek/
>
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>
> http://www.postgresql.org/users-lounge/docs/faq.html
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^ permalink raw reply [nested|flat] 3+ messages in thread
* Re: adding column with not null constraint
2002-10-18 20:12 adding column with not null constraint Vivek Khera <khera@kcilink.com>
@ 2002-10-20 15:26 ` Johannes Lochmann <johannes.lochmann@chello.at>
1 sibling, 0 replies; 3+ messages in thread
From: Johannes Lochmann @ 2002-10-20 15:26 UTC (permalink / raw)
To: pgsql-sql
On Fri, 2002-10-18 at 22:12, Vivek Khera wrote:
> ALTER TABLE msg_owner ADD COLUMN user_optional_fields VARCHAR(255);
> ALTER TABLE msg_owner ALTER user_optional_fields SET DEFAULT '';
> UPDATE msg_owner SET user_optional_fields = '';
>
> Now my problem is I cannot find any syntax for ALTER TABLE ADD
> CONSTRAINT to put a NOT NULL constraint on a column. Can someone help
> me here?
An additional thought to what mallah@trade-india.com said:
BEGIN;
ALTER TABLE msg_owner ADD CONSTRAINT chk_msg_owner_usr_opt_flds_null
CHECK(user_optional_fields IS NOT NULL);
COMMIT;
HTH
Johannes Lochmann
^ permalink raw reply [nested|flat] 3+ messages in thread
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2002-10-18 20:12 adding column with not null constraint Vivek Khera <khera@kcilink.com>
2002-10-18 21:57 ` mallah@trade-india.com
2002-10-20 15:26 ` Johannes Lochmann <johannes.lochmann@chello.at>
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