Обсуждение: Exporting data from view

I read recently about the efforts underway to COPY from a view,
however I was wondering what the current best-practices are for being
able to copy out of a view and import that data into an actual table
elsewhere.  I am currently doing psql -c "SELECT ..." and the using a
bit of perl to transform that into something copyable (i.e. CSV), but
is there a way to directly export the data in an easily importable
form?

Thanks!

google pg_dump




--
+--------------------------------------------
|  Aaron Koning
|  Information Technologist
|  Prince George, BC, Canada.
+--------------------------------------------
|  http://datashare.gis.unbc.ca/fist/
|  http://datashare.gis.unbc.ca/gctp-js/
+--------------------------------------------

On 6/20/06, Aaron Koning <aaronkoning@gmail.com> wrote:
> google pg_dump

Really?  What command do you use?  I've tried the following:

pg_dump -t viewname dbname

and I get the view definition, whereas I would like the data.  Is
there an option to pg_dump that I'm missing?

CREATE TABLE sometable AS SELECT * FROM someview;
pg_dump -t sometable dbname
DROP TABLE sometable

Que? Si!




--
+--------------------------------------------
|  Aaron Koning
|  Information Technologist
|  Prince George, BC, Canada.
+--------------------------------------------
|   http://datashare.gis.unbc.ca/fist/
|  http://datashare.gis.unbc.ca/gctp-js/
+--------------------------------------------

On Tue, Jun 20, 2006 at 10:29:21AM -0700, Aaron Koning wrote:
> CREATE TABLE sometable AS SELECT * FROM someview;
> pg_dump -t sometable dbname
> DROP TABLE sometable
>
> Que? Si!

Eh? If you're going to create the table anyway, I'd use psql:

psql -c "COPY table TO STDOUT"

If you put "CSV" there you can get the output in CSV. Far cleaner than
pg_dump.
--
Martijn van Oosterhout   <kleptog@svana.org>   http://svana.org/kleptog/
> From each according to his ability. To each according to his ability to litigate.

copyable, importable... into Excel or another postgres db?




--
+--------------------------------------------
|  Aaron Koning
|  Information Technologist
|  Prince George, BC, Canada.
+--------------------------------------------
|  http://datashare.gis.unbc.ca/fist/
|  http://datashare.gis.unbc.ca/gctp-js/
+--------------------------------------------

On Tue, Jun 20, 2006 at 12:44:24PM -0700, Aaron Koning wrote:
> copyable, importable... into Excel or another postgres db?

Ofcourse. It doesn't have the table definition ofcourse, just the data.
The CSV format was added specifically for importing into Excel and
similar programs...

--
Martijn van Oosterhout   <kleptog@svana.org>   http://svana.org/kleptog/
> From each according to his ability. To each according to his ability to litigate.

>
> I read recently about the efforts underway to COPY from a view,
> however I was wondering what the current best-practices are for being
> able to copy out of a view and import that data into an actual table
> elsewhere.  I am currently doing psql -c "SELECT ..." and the using a
> bit of perl to transform that into something copyable (i.e. CSV), but
> is there a way to directly export the data in an easily importable
> form?
>

psql -A -t -c "select * from <view>";


You can use -F to set the delimiter
            -o to specify an output file name (or just redirect stdout)

etc.

Try  man psql


To redirect it into a table,

"insert into table ....
 select .... ;"

between databases/systems


psql -d <DB> -p <port> -A -t -c "select * from <view>"; | psql ... "copy
from stdin...;"

can work, as the psql extract can be written to generate the same format
as copy from.


Brent Wood