2010/10/31 Paul <magamos@mail.ru>:
> Tom,
>
> Sunday, October 31, 2010, 9:42:27 PM, you wrote:
>
> TL> Because the SQL standard says so.
>
> But there is not such thing in PostgreSQL as empty set as "IN ()" that must be
> false, because nothing element may be found in empty set.
> And I thought that instead of "IN ()" I could use "IN (NULL)", but I
> was failed and result was NULL and not FALSE. :(
>
(NULL) isn't empty set. Empty set can be
(SELECT 1 WHERE false)
Regards
Pavel
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