Multicolumn primary key with null value

From: Szymon Guz <mabewlun(at)gmail(dot)com>
To: PostgreSQL <pgsql-general(at)postgresql(dot)org>
Subject: Multicolumn primary key with null value
Date: 2010-04-22 17:34:38
Message-ID: v2se4edc9361004221034wa7552e43vac26342c2444f721@mail.gmail.com
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Does any SQL standard allows for a multicolumn primary key where in one
record there is a null in on of the primary key columns?

regards
Szymon Guz

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