2009/12/18 Grzegorz Jaśkiewicz <gryzman@gmail.com>:
> On Fri, Dec 18, 2009 at 2:18 PM, Robert Haas <robertmhaas@gmail.com> wrote:
>
>> NOT IN is the only that really kills you as far as optimization is
>> concerned. IN can be transformed to a join. NOT IN forces a NOT
>> (subplan)-type plan, which bites - hard.
>
> in a well designed database (read: not abusing NULLs) - it can be done
> with joins too.
But not by PostgreSQL, or so I believe.
...Robert
