On Sun, Mar 15, 2009 at 9:39 PM, leopay <leopay@gmail.com> wrote:
>
>
> On Mon, Mar 16, 2009 at 11:36 AM, Scott Marlowe <scott.marlowe@gmail.com>
> wrote:
>>
>> On Sun, Mar 15, 2009 at 9:00 PM, leopay <leopay@gmail.com> wrote:
>> > I wanna if there is any defact when use null column in pg,
>> > e.g. performance issue
>>
>> none that I know of. Any more specific scenarios you're wondering about?
>
> when do the query, the column contain none value could use the index?
Older versions, no, modern versions yes. When that changed, I don't
know, as I'm running only 8.3 anymore.