Re: BUG #6209: Invalid subquery is accepted within a IN() clause - Mailing list pgsql-bugs

On 16.09.2011 12:59, Marc Mamin wrote:
> This is not valid, but is accepted.
>
>
> EXPLAIN analyze
> select * from test_f_files_steps where id in
> (select id from
>     (
>       select file_id,class_id from test_f_files_steps
>       EXCEPT
>       select id,class_id from test_f_files_status
>      )foo
> )

It is valid, it just doesn't do what you might expect. The "id" in
"select id from (..." refers to the id field in the outer query.

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   Heikki Linnakangas
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