Re: constraint deferred but fails?

To automate this, you could define the foreign key constraint with ON
DELETE CASCADE.
So when deleting first delete child rows and then parent.

Thanks & Regards,
*Shreeyansh DBA Team*
www.shreeyansh.com

On Thu, Jan 24, 2019 at 12:05 PM Nagy László Zsolt <gandalf(at)shopzeus(dot)com>
wrote:

>
> Hello,
>
> I have deferred the only fk constraint to this table inside a
> transaction, but I still cannot delete rows from it.
>
> How is that possible?
>
>
> master=> ALTER TABLE doc.display_mode disable trigger user;
> ALTER TABLE
> master=> BEGIN;
> BEGIN
> master=> SET CONSTRAINTS doc.fk_book_display_mode_id DEFERRED;
> SET CONSTRAINTS
> master=> DELETE FROM doc.display_mode;
> ERROR: update or delete on table "display_mode" violates foreign key
> constraint "fk_book_display_mode_id" on table "book"
> DETAIL: Key (id)=(1) is still referenced from table "book".
> master=>
>
>
>