Postgres COPY to CSV - sql

Question

I'm trying to export a query to a csv file using the COPY command in pgAdminIII.
I'm using this command:
COPY (SELECT CASE WHEN cast(click as int) = 1 THEN 1
ELSE -1
END
|| ' '
|| id
|| '|'
|| 'hr_' || substring(hour, 7,8)
--|| ' dw_x' + substring(datename(dw, substring(hour,1,6) ),1,2)
|| ' |dw_' || substring(to_char(to_date(substring(hour, 1,6),'YYMMDD'), 'dy'),1,2)
|| ' |C1_' || c1
|| ' |C21_' || c21
|| ' |C22_' || substring(to_char(to_date(substring(hour, 1,6),'YYMMDD'), 'dy'),1,2) || '_' || substring(hour, 7,8)
AS COL1
FROM clickthru.train limit 10)
TO 'C:\me\train.csv' with csv;
When I run it I get:
ERROR: could not open file "C:\me\train.csv" for writing: Permission denied
SQL state: 42501
I then tried using the following in psql:
grant all privileges on train to public
and then look at access privileges using \z which returns :
but am still getting the same error. I'm using postgresql 9.4 on a Windows 7 box. Any other suggestions?

Answer 1

copy writes the file under the user account of the Postgrs server process (it is a server side operation).
From the manual:
The file must be accessible by the PostgreSQL user (the user ID the server runs as) and the name must be specified from the viewpoint of the server
Under Windows this is the system's "Network Account" by default.
Apparently that account does not have write privileges on that directory.
You have two possible ways of solving that:
change the privileges on the directory to allow everybody full access
use the client side \copy command (in psql) instead