quastions about primary key

From: "jack" <datactrl(at)tpg(dot)com(dot)au>
To: <pgsql-sql(at)postgresql(dot)org>
Subject: quastions about primary key
Date: 2003-01-24 06:44:59
Message-ID: 00c301c2c374$1e698650$1400a8c0@jac
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Is that possible to have a two columns primary key on a table with null
value on second column?

Jack

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