Re: PL/pgSQL PERFORM with CTE

2013-08-20 14:35 keltezéssel, David E. Wheeler írta:
> On Aug 20, 2013, at 2:31 PM, Pavel Stehule <pavel.stehule@gmail.com> wrote:
>
>> but it works
>>
>> postgres=# do $$begin with x as (select 10) insert into omega select * from x; end;$$;
>> DO
> But this does not:
>
> david=# DO $$
> david$# BEGIN
> david$#     PERFORM * FROM (
> david$#         WITH inserted AS (
> david$#             INSERT INTO foo values (1) RETURNING id
> david$#         ) SELECT inserted.id
> david$#     ) x;
> david$# END;
> david$# $$;
> ERROR:  WITH clause containing a data-modifying statement must be at the top level
> LINE 2:         WITH inserted AS (
>                       ^
> QUERY:  SELECT * FROM (
>          WITH inserted AS (
>              INSERT INTO foo values (1) RETURNING id
>          ) SELECT inserted.id
>      ) x
> CONTEXT:  PL/pgSQL function inline_code_block line 3 at PERFORM

This is the same error as if you put the WITH into a subquery,
which is what PERFORM does.

Proof:

SELECT * FROM (    WITH inserted AS (        INSERT INTO foo values (1) RETURNING id    ) SELECT inserted.id
) x;


Best regards,
Zoltán Böszörményi

-- 
----------------------------------
Zoltán Böszörményi
Cybertec Schönig & Schönig GmbH
Gröhrmühlgasse 26
A-2700 Wiener Neustadt, Austria
Web: http://www.postgresql-support.de     http://www.postgresql.at/