Re: Can I use check-constraint to set null?

Rikard Bosnjakovic <rikard(dot)bosnjakovic(at)gmail(dot)com> wrote:

> (Postgres 8.4.2)
>
> CREATE TABLE test (foo numeric(8,2) CHECK (foo >= 0.0));
>
> ecdb=> insert into test values (-2.2);
> ERROR: new row for relation "test" violates check constraint "test_foo_check"
>
> This is expected.
>
> However, is there a way to insert a null when this check fails,
> instead of returning an error (and thus aborting the insert)? I'm
> reading on http://www.postgresql.org/docs/current/static/ddl-constraints.html
> but cannot find an answer to this question.

I think, you should use a TRIGGER.

Andreas
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