From: | Josh Berkus <josh(at)agliodbs(dot)com> |
---|---|
To: | Stephan Szabo <sszabo(at)megazone23(dot)bigpanda(dot)com> |
Cc: | <pgsql-sql(at)postgresql(dot)org> |
Subject: | Re: Constraint problem |
Date: | 2002-05-16 20:49:18 |
Message-ID: | 200205161349.18499.josh@agliodbs.com |
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Thread: | |
Lists: | pgsql-sql |
Stephan,
> I unfortunately can't think of a good workaround. AFAICT, Unique should
> wait until after all of the updates but our implementation doesn't
> currently do so.
>
> Hopefully someone will have some ideas, because the best I can think of
> requires an additional full table scan to check uniqueness and the
> concurrency issues would be a bear.
Hmm ... I can put up with that, I think. This table doesn't get modified very
often, and I can afford to table-level lock it during modification.
However, I can't think of how I could implement a BEFORE ... FOR EACH
STATEMENT trigger that would check for duplicates in the final result. I can
only deal with one row at a time using the NEW record.
Suggestions?
--
-Josh Berkus
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