On Wed, 2005-04-27 at 02:12, Stephane Bortzmeyer wrote:
> On Tue, Apr 26, 2005 at 03:48:44PM -0500,
> Scott Marlowe <smarlowe@xxxxxxxxxxxxxxxxx> wrote
> a message of 26 lines which said:
>
> > Here's a quote from the SQL1992 spec that's VERY clear:
>
> Yes, PostgreSQL is right and implement the standard. Now, what's the
> rationale for the standard? I understand it for a single column but,
> for several columns, it should be still possible to have different
> tuples, such as (3, NULL) and (5, NULL) for instance.
Since NULL <> NULL, that means you could then have
(5,NULL) and (5,NULL) since the two NULLS aren't equal.
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