Re: Flat File unload/export/copy

Sean,
8.1.10 - I read the docs first (which is a first for me!) before I posted and couldn't see a 'specific' data based row unload. I suppose I can always simply execute the sql and re-direct the output to a file (that just crossed my mind) - I'll try that tomorrow (I think I can unset headings in psql as well - so that will give me a pseudo 'unload/copy' file I think)

On Fri, 2008-09-12 at 12:20 -0400, Sean Davis wrote:

On Fri, Sep 12, 2008 at 12:10 PM, Steve T <steve@retsol.co.uk> wrote:
> Regina,
> I wasn't aware that you could!
> I just tried and that syntax gave me an error:
> rel_reinsure=# copy (select * from client where name like '%BERT%') to
> '/tmp/stevet.clients';
> ERROR:  syntax error at or near "(" at character 6
> LINE 1: copy (select * from client where name like '%BERT%') to '/tm...
>
> - I can do though:
> rel_reinsure=# copy client (recno,code,name) to '/tmp/stevet.clients';
>
> ... or select all columns, but that is 'too global' and I just want 'WHERE
> name LIKE '%BERT%' type syntax.

What version of Postgres are you using?  The docs for the version can
give you an idea about syntax.

Sean

>
> On Fri, 2008-09-12 at 11:31 -0400, Obe, Regina wrote:
>
> And why can't you use copy?
>
> Something like below -
>
> COPY (SELECT * FROM sometable WHERE somevalue LIKE '%') TO
> '/path/to/textfile.csv'
>
> WITH NULL As 'NULL' CSV HEADER QUOTE AS '"';
>
>
>
>
> ________________________________
>
> From: pgsql-novice-owner@postgresql.org
> [mailto:pgsql-novice-owner@postgresql.org] On Behalf Of Steve T
> Sent: Friday, September 12, 2008 11:16 AM
> To: PostGreSQL
> Subject: [NOVICE] Flat File unload/export/copy
>
>
> Is there a command that copies data from a table to a flat file for
> specified selection criteria?
> IE akin to a copy but not dumping a whole file?
> If I'm about to do a major change to data in a table, I'd like to be
> able to keep a copy of the data before the change (I know I can
> Begin...rollback should things go wrong).
>
> Is there a command that I've missed? (Informix had an 'UNLOAD TO blah
> SELECT blah..' type command which presumably was proprietary).
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>
> Steve Tucknott
> ReTSol Ltd
>
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Steve Tucknott ReTSol Ltd DDI:         01323 488548 Mobile:     0773 671 5772