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Re: Using COPY for bulk upload in a table with sequence field

From: Michael Fuhr <mike(at)fuhr(dot)org>
To: Gautam Saha <gsaha(at)imsa(dot)edu>
Cc: pgsql-admin(at)postgresql(dot)org
Subject: Re: Using COPY for bulk upload in a table with sequence field
Date: 2005-01-19 01:59:37
Message-ID: 20050119015937.GA55639@winnie.fuhr.org (view raw or flat)
Thread:
Lists: pgsql-admin
On Tue, Jan 18, 2005 at 05:43:51PM -0600, Gautam Saha wrote:

> Can I use COPY command to upload a flat text file into a PG table where
> the PK  column (item_id) is Serial type.

What does the documentation say?  What happened when you tried it?

It can be educational to practice on test data so mistakes don't
matter.  And when changing "real" data, consider using a transaction
so you can verify that the changes are correct: issue a BEGIN
statement, then make the changes, then issue enough SELECT statements
to satisfy you that the changes are correct, then issue a COMMIT.
If the changes don't look right then do a ROLLBACK.

Here's an excerpt from the COPY page in the Reference part of the
documentation:

  If a list of columns is specified, COPY will only copy the data in
  the specified columns to or from the file.  If there are any columns
  in the table that are not in the column list, COPY FROM will insert
  the default values for those columns.

Here's an experiment:

CREATE TABLE foo (id serial PRIMARY KEY, name text);
INSERT INTO foo (name) values ('John');
INSERT INTO foo (name) values ('David');

SELECT * FROM foo ORDER BY id;
 id | name  
----+-------
  1 | John
  2 | David
(2 rows)

COPY foo (name) FROM stdin;
James
Robert
\.

SELECT * FROM foo ORDER BY id;
 id |  name  
----+--------
  1 | John
  2 | David
  3 | James
  4 | Robert
(4 rows)

-- 
Michael Fuhr
http://www.fuhr.org/~mfuhr/

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