Обсуждение: copy limited number of records

Howdy:

Running PostgreSQL 7.2.1 on RedHat Linux 7.2.

I'm using copy to create a bunch of flat files with delimiters
and it's going okay.  I've been asked, however, that the clients
don't actually want ALL of the data in the table; perhaps about
100 or so records for testing.

Is there a way to use limit while using the \copy command?
(e.g., \copy t_test_tbl to '/usr/local/home/admin/dev_tbls' using delimiters ',' limit 10)

I know the above doesn't work, but, perhaps there is a work around?

Thanks!

-X

Howabout using SELECT INTO ... LIMIT ... to select into a temporary
table and then run COPY on it?

Lee.

Johnson, Shaunn writes:
 > Running PostgreSQL 7.2.1 on RedHat Linux 7.2.
 >
 > I'm using copy to create a bunch of flat files with delimiters
 > and it's going okay.  I've been asked, however, that the clients
 > don't actually want ALL of the data in the table; perhaps about
 > 100 or so records for testing.
 >
 > Is there a way to use limit while using the \copy command?
 > (e.g., \copy t_test_tbl to '/usr/local/home/admin/dev_tbls' using delimiters
 > ',' limit 10)
 >
 > I know the above doesn't work, but, perhaps there is a work around?
 >

On Mon, 2002-11-04 at 15:02, Johnson, Shaunn wrote:
> Howdy:
>
> Running PostgreSQL 7.2.1 on RedHat Linux 7.2.
>
> I'm using copy to create a bunch of flat files with delimiters
> and it's going okay.  I've been asked, however, that the clients
> don't actually want ALL of the data in the table; perhaps about
> 100 or so records for testing.
>
> Is there a way to use limit while using the \copy command?
> (e.g., \copy t_test_tbl to '/usr/local/home/admin/dev_tbls' using delimiters
> ',' limit 10)
>
> I know the above doesn't work, but, perhaps there is a work around?

You can use Unix commands:

head -100 /usr/local/home/admin/dev_tbls |
    psql -d your_db -c "COPY t_test_tbl FROM STDIN"

--
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
                 ========================================
     "Lo, children are an heritage of the LORD; and the
      fruit of the womb is his reward."        Psalms 127:3

SELECT * INTO t_test_table_out FROM t_test_table LIMIT 10;
COPY t_test_table_out TO '/usr/local/home/admin/dev_tbls' USING DELIMITERS ',';
DROP TABLE t_test_table_out;

HTH,

CG

--- Oliver Elphick <olly@lfix.co.uk> wrote:
> On Mon, 2002-11-04 at 15:02, Johnson, Shaunn wrote:
> > Howdy:
> >
> > Running PostgreSQL 7.2.1 on RedHat Linux 7.2.
> >
> > I'm using copy to create a bunch of flat files with delimiters
> > and it's going okay.  I've been asked, however, that the clients
> > don't actually want ALL of the data in the table; perhaps about
> > 100 or so records for testing.
> >
> > Is there a way to use limit while using the \copy command?
> > (e.g., \copy t_test_tbl to '/usr/local/home/admin/dev_tbls' using
> delimiters
> > ',' limit 10)
> >
> > I know the above doesn't work, but, perhaps there is a work around?
>
> You can use Unix commands:
>
> head -100 /usr/local/home/admin/dev_tbls |
>     psql -d your_db -c "COPY t_test_tbl FROM STDIN"
>
> --
> 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
>                  ========================================
>      "Lo, children are an heritage of the LORD; and the
>       fruit of the womb is his reward."        Psalms 127:3
>
>
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