From: Oliver Elphick <olly@lfix.co.uk>
To: Andreas Tille <tillea@rki.de>
Cc: PostgreSQL SQL <pgsql-sql@postgresql.org>
Subject: Re: Separating data sets in a table
Date: 26 Aug 2002 09:36:48 +0100
Message-ID: <1030351008.20178.21.camel@linda> (raw)
In-Reply-To: <Pine.LNX.4.44.0208260820060.27720-100000@wr-linux02.rki.ivbb.bund.de>
References: <Pine.LNX.4.44.0208260820060.27720-100000@wr-linux02.rki.ivbb.bund.de>
On Mon, 2002-08-26 at 07:26, Andreas Tille wrote:
> Well for sure this might be an option but as I said I receive the data
> in the dump format apropriate to use "COPY <tablemane> FROM <file>". Would
> you really like to suggest me to split those data sets into single lines?
> Moreover I'm not sure about how to catch the error messages of failed
> COPY statements.
How about this approach:
Create a temporary table (no constraints)
CREATE TEMP TABLE temptable AS
(SELECT * FROM tablename LIMIT 1);
DELETE FROM temptable;
Copy all data into the temporary table
COPY temptable FROM 'filepath';
Select from the temporary table all items that satisfy the
constraints, insert them into the real table and delete them from
the temporary table:
BEGIN;
INSERT INTO tablename (SELECT * FROM temptable WHERE ...);
DELETE FROM temptable WHERE ...;
COMMIT;
All good data should now be in place. The temporary table should
now contain only those items that do not satisfy the constraints for
the real table.
--
Oliver Elphick Oliver.Elphick@lfix.co.uk
Isle of Wight, UK
http://www.lfix.co.uk/oliver
GPG: 1024D/3E1D0C1C: CA12 09E0 E8D5 8870 5839 932A 614D 4C34 3E1D 0C1C
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To: pgsql-sql@postgresql.org
Cc: olly@lfix.co.uk, tillea@rki.de
Subject: Re: Separating data sets in a table
In-Reply-To: <1030351008.20178.21.camel@linda>
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