On 10/6/23 07:20, Andreas Kretschmer wrote:
Am 06.10.23 um 13:53 schrieb Luca Ferrari:
Hi all,
I'm wondering why in COPY TO (file or program) I cannot use generated
columns: since I'm pushing data out of the table, why they are not
allowed?
Example:
testdb=# CREATE TABLE test( pk int generated always as identity primary key
, ts timestamp default current_timestamp
, month int generated always as ( extract( month from ts ) ) stored
);
testdb=# insert into test( ts ) values( current_timestamp );
testdb=# copy test to program 'head'; -- ok but silently removes the column
COPY 1
testdb=# copy test( month ) to program 'head';
ERROR: column "month" is a generated column
DETAIL: Generated columns cannot be used in COPY.
you can use copy (select * ...) to ...
But why not?
--
Born in Arizona, moved to Babylonia.
