Re: adding column with not null constraint - Mailing list 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