| From: | Richard Huxton <dev(at)archonet(dot)com> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Simon Riggs <simon(at)2ndquadrant(dot)com>, Zoltan Boszormenyi <zb(at)cybertec(dot)at>, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: Behavior of GENERATED columns per SQL2003 |
| Date: | 2007-05-11 07:32:56 |
| Message-ID: | 46441C28.6000003@archonet.com |
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| Lists: | pgsql-hackers |
Tom Lane wrote:
> "Simon Riggs" <simon(at)2ndquadrant(dot)com> writes:
>> On Thu, 2007-05-10 at 10:11 -0400, Tom Lane wrote:
>>> As for GENERATED ALWAYS AS (expr), now that we understand that it's not
>>> supposed to define a virtual column, what's the point?
>
>> We do need virtual columns, whether the spec requires them or not.
>
> Agreed, they seem more useful than what the spec's got in mind. You can
> fake a virtual column using a view, but it's a whole lot more painful
> than faking a GENERATED column using a trigger (at least if you wish the
> view to be updatable).
If they could play a part in foreign keys that would be useful too.
--
Richard Huxton
Archonet Ltd
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