>>> "Wojciech Tylek" <wat@wat.net.pl> wrote:
> Why the query like:
>
> select * from b where a_id in (select a_id from a where b_id in
(10,20));
>
> does not return error?
> The table "a" does not have b_id!
This is a correlated subquery. A previous list post on the topic:
http://archives.postgresql.org/pgsql-general/2007-06/msg01659.php
I hope this helps.
-Kevin
