elein <[EMAIL PROTECTED]> writes:
> In 8.0 we get:
> elein=# select 1 in (NULL, 1, 2);
> ?column?
> ----------
> t
> (1 row)
> elein=# select 3 not in (NULL, 1, 2);
> ?column?
> ----------
> (1 row)
> For consistency, either both should return NULL or
> both return true/false.
The above behavior is correct per spec. Feel free to argue its
consistency with the SQL committee ;-)
Note that the above are not inverses because you changed the lefthand
input. You do get consistent results when you just add or omit NOT:
regression=# select 1 not in (NULL, 1, 2);
?column?
----------
f
(1 row)
regression=# select 3 in (NULL, 1, 2);
?column?
----------
(1 row)
regards, tom lane
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