| From: | Joe <dev(at)freedomcircle(dot)net> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Bryce Nesbitt <bryce1(at)obviously(dot)com>, pgsql-sql(at)postgresql(dot)org |
| Subject: | Re: Is this a bug? Deleting a column deletes the constraint. |
| Date: | 2006-10-12 09:39:47 |
| Message-ID: | 1160645987.51367.13.camel@pampa |
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| Thread: | |
| Lists: | pgsql-sql |
On Thu, 2006-10-12 at 01:25 -0400, Tom Lane wrote:
> It does seem like this is wrong, in view of SQL92's statement about
> ALTER TABLE DROP COLUMN:
>
> 4) If RESTRICT is specified, then C shall not be referenced in
> the <query expression> of any view descriptor or in the <search
> condition> of any constraint descriptor other than a table con-
> straint descriptor that contains references to no other column
> and that is included in the table descriptor of T.
>
> IOW we should only allow unique constraints to be auto-dropped if
> they reference just the one single column. Ick.
I didn't realize before that you can also drop all columns, leaving a
table without *any* columns. Is that a SQL92 "feature"?
Joe
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