Single row tables

From: KÖPFERL Robert <robert(dot)koepferl(at)sonorys(dot)at>
To:
Cc: pgsql-sql(at)postgresql(dot)org
Subject: Single row tables
Date: 2005-01-11 14:45:36
Message-ID: ED4E30DD9C43D5118DFB00508BBBA76EB1653A@neptun.sonorys.at
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Hi,

with what constraint or how can I ensure that one of my tables has exact one
record or 0..1 records?

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