Обсуждение: Can't SELECT from (INSERT ... RETURNING)

I thought I could use the output of INSERT...RETURNING as a set of
tuples for a subquery,
but it seems it's not the case:

nb1=# select * from (insert into m(a) values(112) returning a);
ERROR:  syntax error at or near "into"
LINE 1: select * from (insert into m(a) values(112) returni...
                              ^

Is this a bug or it's not even supposed to work in theory?
Such a feature would be extremely useful to have.

P.S.
I know it's non-portable, but this is not a problem.

Thanks,

             Nico

On 7/18/07, Nico Sabbi <nsabbi@officinedigitali.it> wrote:
> I thought I could use the output of INSERT...RETURNING as a set of
> tuples for a subquery,
> but it seems it's not the case:
>
> nb1=# select * from (insert into m(a) values(112) returning a);
> ERROR:  syntax error at or near "into"
> LINE 1: select * from (insert into m(a) values(112) returni...
>                               ^
>
> Is this a bug or it's not even supposed to work in theory?
> Such a feature would be extremely useful to have.

it's on the TODO. It's a frequently requested feature.  It's more
complicated than it looks on the surface.

merlin