[GENERAL] re-using RETURNING
A. Kretschmer
just to be sure, it is still (8.4) not possible to use RETURNING within an
other INSERT?
To show what i mean:
test=*# insert into foo2 (id1, id2) (insert into foo(n) values ('a'),('b'),('c') returning currval('some_sequence'), id);
ERROR: syntax error at or near "insert"
LINE 1: insert into foo2 (id1, id2) (insert into foo(n) values ('a')...
I know, it is intended in 8.5 with the 'WITH' - clause, but not yet in 8.4, right?
(and there are no other RDBMS which can do that?)
Thanks, Andreas
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Andreas Kretschmer
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Grzegorz Jaśkiewicz
Hi,
just to be sure, it is still (8.4) not possible to use RETURNING within an
other INSERT?
--
GJ
Emanuel Calvo Franco
> Hi,
>
> just to be sure, it is still (8.4) not possible to use RETURNING within an
> other INSERT?
>
> To show what i mean:
>
> test=*# insert into foo2 (id1, id2) (insert into foo(n) values ('a'),('b'),('c') returning currval('some_sequence'), id);
> ERROR: syntax error at or near "insert"
> LINE 1: insert into foo2 (id1, id2) (insert into foo(n) values ('a')...
>
> I know, it is intended in 8.5 with the 'WITH' - clause, but not yet in 8.4, right?
>
> (and there are no other RDBMS which can do that?)
Well there is a little trik in actual versions...
use these options:
\a
\t
\o /tmp/archivo.csv
then
DELETE FROM tabla WHERE entero =13 RETURNING *;
(remember that you can throught this query from shell command line, with
psql options)
(next step, delete the last line of the file archivo.csv: DELETE 9890)
create a clon - void table (this will be your log table, if you have
already created this
, avoid this step):
postgres=# CREATE TABLE tabla_2 AS SELECT * FROM tabla WHERE 1=0;
SELECT
Then you can go with this
postgres=# COPY tabla_2 FROM '/tmp/returnes.csv' DELIMITER '|';
COPY 19780
postgres=# SELECT * from tabla_2 limit 1;
entero
--------
13
(1 row)
Obviusly, you can automatize these steps in a shell script.
Hope you enjoy it.
--
Emanuel Calvo Franco
DBA at: www.siu.edu.ar
www.emanuelcalvofranco.com.ar
Craig Ringer
> Hi,
>
> just to be sure, it is still (8.4) not possible to use RETURNING within an
> other INSERT?
Not directly, now. However, if I recall correctly in 8.4 you *CAN* use a
... RETURNING statement within an SQL function, and use the results of
that in another query.
--
Craig Ringer
Andreas Kretschmer
> Hi,
>
> just to be sure, it is still (8.4) not possible to use RETURNING within an
> other INSERT?
Thx for all replies. It is not a really problem, i will write a
benchmark to compare the new writeable CTE (in 8.5 alpha) with the old
style (8.4). That's all ;-)
And yes, i will publish the result, of course.
Andreas
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Andreas Kretschmer
> A. Kretschmer <andreas.k...@schollglas.com> wrote:
>
> > Hi,
> >
> > just to be sure, it is still (8.4) not possible to use RETURNING within an
> > other INSERT?
>
> Thx for all replies. It is not a really problem, i will write a
> benchmark to compare the new writeable CTE (in 8.5 alpha) with the old
> style (8.4). That's all ;-)
>
> And yes, i will publish the result, of course.
http://akretschmer.blogspot.com/2009/11/writeable-cte-short-performance-test.html
Jasen Betts
> Hi,
>
> just to be sure, it is still (8.4) not possible to use RETURNING within an
> other INSERT?
not in pure SQL, but it should be possible in PLPGSQL etc.