From: Tom Lane <tgl@sss.pgh.pa.us>
To: mailreg@numerixtechnology.de
Cc: pgsql-sql <pgsql-sql@postgresql.org>
Subject: Re: CHECK col A not NULL if col B='x'
Date: Tue, 28 Sep 2004 18:36:30 -0400
Message-ID: <20207.1096410990@sss.pgh.pa.us> (raw)
In-Reply-To: <41597CD2.1030602@numerixtechnology.de>
References: <41596EDA.4030909@numerixtechnology.de>
<200409281112.02986.martin@bugs.unl.edu.ar>
<41597CD2.1030602@numerixtechnology.de>
T E Schmitz <mailreg@numerixtechnology.de> writes:
> I noticed a table constraint can be added via ALTER TABLE. Is it correct
> that a column constraint cannot be added via the ALTER TABLE other than
> by dropping and adding the column? (I am using psql 7.4.2.)
There is no difference between table and column constraints in PG. Just
write it as a table constraint in ALTER TABLE.
regards, tom lane
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To: pgsql-sql@postgresql.org
Cc: tgl@sss.pgh.pa.us, mailreg@numerixtechnology.de
Subject: Re: CHECK col A not NULL if col B='x'
In-Reply-To: <20207.1096410990@sss.pgh.pa.us>
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