size of NULL field?

From: nazgul(at)punkass(dot)spam (nazgul)
To: pgsql-general(at)postgresql(dot)org
Subject: size of NULL field?
Date: 2002-04-13 23:01:27
Message-ID: slrnabhep9.2sv.nazgul@demon.infocalypse.org
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Hi, I'm wondering how much storage space a NULL value takes up? Does it
still use up as much space as the column's datatype, or just 1 byte, or some
other amount?

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