| From: | Stephan Szabo <sszabo(at)megazone23(dot)bigpanda(dot)com> |
|---|---|
| To: | Keary Suska <hierophant(at)pcisys(dot)net> |
| Cc: | Postgres General <pgsql-general(at)postgresql(dot)org> |
| Subject: | Re: Column 'CHECK' Constraint: bug or ? |
| Date: | 2001-09-20 05:21:16 |
| Message-ID: | Pine.BSF.4.21.0109192216350.71501-100000@megazone23.bigpanda.com |
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| Lists: | pgsql-general |
On Wed, 19 Sep 2001, Keary Suska wrote:
> It appears that Postgres checks column CHECK constraints when performing an
> update regardless of whether the particular column is being updated. Perhaps
> my understanding of column vs table constraints is incomplete but this
> doesn't seem to be proper behavior, and I can't find it documented anywhere.
If I read spec correctly, a column check constraint is equivalent to a
table constraint of the same search condition (and name and
attributes) for purposes of checking the constraint which means it should
be valid at end of transaction/statement depending on the constraint
attributes (and we don't support deferred check right now).
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