Re: Support for idempotent schema changes? - Mailing list pgsql-general

David Lowe wrote:
> So how can I make statements of the form:

> *      alter table only customers add constraint
> a_previously_missed_constraint unique (a, b, c);
>
> *      add column points int4 not null default 0;

> idempotent?

You just ignore the error if the object already exists.

--
Peter Eisentraut
http://developer.postgresql.org/~petere/