On Mon, Apr 20, 2020 at 08:31:29PM -0400, Bruce Momjian wrote:
> On Mon, Apr 20, 2020 at 04:21:32PM -0400, Tom Lane wrote:
> > [ sorry, I'd lost track of this thread ]
> >
> > Bruce Momjian writes:
> > > I now remember that I wrote the first IS NULL in:
> > > CREATE UNIQUE INDEX tests_target_on
On Mon, Apr 20, 2020 at 04:21:32PM -0400, Tom Lane wrote:
> [ sorry, I'd lost track of this thread ]
>
> Bruce Momjian writes:
> > I now remember that I wrote the first IS NULL in:
> > CREATE UNIQUE INDEX tests_target_one_null ON tests ((target IS NULL))
> > WHERE target IS NULL;
> > in hope t
[ sorry, I'd lost track of this thread ]
Bruce Momjian writes:
> I now remember that I wrote the first IS NULL in:
> CREATE UNIQUE INDEX tests_target_one_null ON tests ((target IS NULL)) WHERE
> target IS NULL;
> in hope that if someone is looking for the null value in the column, the
> IS NUL
On Fri, Apr 10, 2020 at 08:17:09PM -0400, Bruce Momjian wrote:
> On Fri, Apr 10, 2020 at 07:21:29PM -0400, Tom Lane wrote:
> > Bruce Momjian writes:
> > > I agree with your analysis. I still want to have some mention that
> > > partial indexes can be used to create single-NULL columns, which migh
