Re: [GENERAL] \copy combine with SELECT

[jia ding]

Thanks Martijn.

\d test
   Table "public.test"
 Column |  Type   | Modifiers
 id | integer |
 score| integer |

I tried \copy test (score) to test.txt. It works well.

But, suppose I want to select rows  with score > 20 (just an example).
Then,\copy table [ ( column_list ) ] { from | to } filename  doesn't
help much.


Have a nice weekend!

N



On 3/17/06, Martijn van Oosterhout  wrote:
> On Fri, Mar 17, 2006 at 10:45:16AM +1100, Chris wrote:
> > Doesn't look like \copy lets you specify which fields to include though.
>
> Ofcourse it does, you just need to use parenthesis. From the manpage:
>
> \copy table [ ( column_list ) ] { from | to } filename | stdin | stdout
> [ with ] [ oids ] [ delimiter [as]  'character' ] [ null [as]  'string' ]
>
> Have a nice day,
> --
> Martijn van Oosterhout  http://svana.org/kleptog/
> > Patent. n. Genius is 5% inspiration and 95% perspiration. A patent is a
> > tool for doing 5% of the work and then sitting around waiting for someone
> > else to do the other 95% so you can sue them.
>
>
> -BEGIN PGP SIGNATURE-
> Version: GnuPG v1.4.1 (GNU/Linux)
>
> iD8DBQFEGt++IB7bNG8LQkwRAvRlAJ9b3KJX82JviBnhTmexPa6nJlP2iACcD6gl
> 5jLonNJA7sZpl1jxY+LQQ1E=
> =eepY
> -END PGP SIGNATURE-
>
>
>

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Re: [GENERAL] \copy combine with SELECT

[Martijn van Oosterhout]

On Fri, Mar 17, 2006 at 10:45:16AM +1100, Chris wrote:
> Doesn't look like \copy lets you specify which fields to include though.

Ofcourse it does, you just need to use parenthesis. From the manpage:

\copy table [ ( column_list ) ] { from | to } filename | stdin | stdout
[ with ] [ oids ] [ delimiter [as]  'character' ] [ null [as]  'string' ]

Have a nice day,
-- 
Martijn van Oosterhout  http://svana.org/kleptog/
> Patent. n. Genius is 5% inspiration and 95% perspiration. A patent is a
> tool for doing 5% of the work and then sitting around waiting for someone
> else to do the other 95% so you can sue them.


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Re: [GENERAL] \copy combine with SELECT

[Chris]

jia ding wrote:

yes, of couse COPY

but,
=> copy test to 'test.txt';
ERROR:  must be superuser to COPY to or from a file
HINT:  Anyone can COPY to stdout or from stdin. psql's \copy command 
also works for anyone.


Straight from the documentation:

Do not confuse COPY with the psql instruction \copy. \copy invokes COPY 
FROM STDIN or COPY TO STDOUT, and then fetches/stores the data in a file 
accessible to the psql client. Thus, file accessibility and access 
rights depend on the client rather than the server when \copy is used.


http://www.postgresql.org/docs/8.1/static/sql-copy.html


Doesn't look like \copy lets you specify which fields to include though.

alive=# \d a
   Table "public.a"
 Column |  Type   | Modifiers
+-+---
 a  | integer |


db=# \copy a to ./blah.sql (works)

db=# \copy a a to ./blah.sql
\copy: parse error at "a"



On 3/16/06, *Chris* <[EMAIL PROTECTED] > wrote:

jia ding wrote:
 > Hi all,
 >
 > I tried:
 > select id, name  into table2   from table1;
 >  \copy table2 to filename.txt
 > in order to export 2 columns from table1 to a file.
 >
 > But, I am thinking, if there is a command can combine these two
command
 > together?
 > Maybe, something like: \copy select id,name  from table  to
filename.txt

Close.

copy tablename field1, field2 to 'filename';

http://www.postgresql.org/docs/8.1/static/sql-copy.html

--
Postgresql & php tutorials
http://www.designmagick.com/





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Postgresql & php tutorials
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Re: [GENERAL] \copy combine with SELECT

[jia ding]

yes, of couse COPYbut,=> copy test to 'test.txt';ERROR:  must be superuser to COPY to or from a fileHINT:  Anyone can COPY to stdout or from stdin. psql's \copy command also works for anyone.
On 3/16/06, Chris <[EMAIL PROTECTED]> wrote:
jia ding wrote:> Hi all,>> I tried:> select id, name  into table2   from table1;>  \copy table2 to filename.txt> in order to export 2 columns from table1 to a file.>> But, I am thinking, if there is a command can combine these two command
> together?> Maybe, something like: \copy select id,name  from table  to filename.txtClose.copy tablename field1, field2 to 'filename';
http://www.postgresql.org/docs/8.1/static/sql-copy.html--Postgresql & php tutorialshttp://www.designmagick.com/

Re: [GENERAL] \copy combine with SELECT

[Qingqing Zhou]

""jia ding"" <[EMAIL PROTECTED]> wrote

> I tried:
> select id, name  into table2   from table1;
>  \copy table2 to filename.txt
> in order to export 2 columns from table1 to a file.
>
> But, I am thinking, if there is a command can combine these two
> command together?

Notice that COPY command can be used like this:
COPY  ['(' columnList ')'] FROM/TO [WITH options]

Regards,
Qingqing




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Re: [GENERAL] \copy combine with SELECT

[Chris]

jia ding wrote:

Hi all,

I tried:
select id, name  into table2   from table1;
 \copy table2 to filename.txt
in order to export 2 columns from table1 to a file.

But, I am thinking, if there is a command can combine these two command 
together?

Maybe, something like: \copy select id,name  from table  to filename.txt


Close.

copy tablename field1, field2 to 'filename';

http://www.postgresql.org/docs/8.1/static/sql-copy.html

--
Postgresql & php tutorials
http://www.designmagick.com/

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