| From: | Alban Hertroys <haramrae(at)gmail(dot)com> |
|---|---|
| To: | Rafal Pietrak <rafal(at)ztk-rp(dot)eu> |
| Cc: | pgsql-general(at)postgresql(dot)org |
| Subject: | Re: partial "on-delete set null" constraint |
| Date: | 2015-01-03 18:04:02 |
| Message-ID: | 35D8084A-00DF-4FD8-AB5D-71846EF952AE@gmail.com |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-general |
> On 03 Jan 2015, at 14:11, Alban Hertroys <haramrae(at)gmail(dot)com> wrote:
>
> On 02 Jan 2015, at 13:31, Rafal Pietrak <rafal(at)ztk-rp(dot)eu> wrote:
>> Would it violate SQL standard (signifficantly), if an "on delete set null" action just ignored all the FK columns that have a "NOT NULL" constraint set?
>
> As I understand it, this is precisely why Boyce-relationality forbids NULLs in primary keys, although I’m not so sure he’s right about that.
Well, that’s embarrassing, it’s only a few weeks since I learned this and I’m already attributing the theory to the wrong database deity! That’s Codd-relationality, of course. Not Boyce.
Alban Hertroys
--
If you can't see the forest for the trees,
cut the trees and you'll find there is no forest.
| From | Date | Subject | |
|---|---|---|---|
| Next Message | Alban Hertroys | 2015-01-03 18:08:00 | Re: partial "on-delete set null" constraint |
| Previous Message | Adrian Klaver | 2015-01-03 18:01:36 | Re: partial "on-delete set null" constraint |