>>> "Wojciech Tylek" <[EMAIL PROTECTED]> 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
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