From: | Michael Fuhr <mike(at)fuhr(dot)org> |
---|---|
To: | Keith Worthington <keithw(at)narrowpathinc(dot)com> |
Cc: | PostgreSQL Novice <pgsql-novice(at)postgresql(dot)org> |
Subject: | Re: Null vs empty string |
Date: | 2004-12-04 03:27:56 |
Message-ID: | 20041204032756.GB55376@winnie.fuhr.org |
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Lists: | pgsql-novice |
On Fri, Dec 03, 2004 at 08:57:24PM -0500, Keith Worthington wrote:
> I am loading data into a PostgreSQL v7.3.6 database running on RedHat
> Enterprise Linux ES. This is accomplished by a shell script running the COPY
> command. The data is in comma seperated value format.
>
> I am experiencing two difficulties.
>
> Firstly, when loading a missing (consecutive commas) numeric value (int4) an
> error message is generated indicating that the string cannot be parsed. I
> would prefer that a NULL value be inserted.
>
> Secondly, when loading a missing (consecutive commas) string (varchar) an
> empty string is inserted. Again, I would prefer that a NULL value be inserted
> as later on a foreign key constraint complains bitterly about not being able
> to match the empty string. :-(
Have you tried using NULL AS?
COPY foo FROM stdin WITH DELIMITER ',' NULL AS '';
Would that break anything else for you? An alternative would be
to replace the empty fields in your data with \N, the default string
that represents NULL.
--
Michael Fuhr
http://www.fuhr.org/~mfuhr/
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