NOT IN (NULL) ?

From: "Paul" <magamos(at)mail(dot)ru>
To: pgsql-general(at)postgresql(dot)org
Subject: NOT IN (NULL) ?
Date: 2010-10-31 16:37:28
Message-ID: 339664006.20101031213728@mail.ru
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Please, help me.
Why the condition
SELECT 5 NOT IN (NULL)
returns NULL, but not FALSE (as I thought)?

--
Paul

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