Re: PostgreSQL and ACID properties support

From: Stephan Szabo <sszabo(at)megazone(dot)bigpanda(dot)com>
To: Neil Zanella <nzanella(at)cs(dot)mun(dot)ca>
Cc: <pgsql-general(at)postgresql(dot)org>
Subject: Re: PostgreSQL and ACID properties support
Date: 2003-08-09 17:34:12
Message-ID: 20030809103107.I11786-100000@megazone.bigpanda.com
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On 7 Aug 2003, Neil Zanella wrote:

> of transactions as opposed to the operations taking place serially? Also, does
> PostgreSQL fully support SQL99 CHECK constraints? And if the system crashes...

Technically no. Check constraints with subselects are not supported.
Using a function gets you half the constraint, but doesn't notice
modifications to the other table(s) involved. You might need triggers
to handle that portion.

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