On Sat, Jan 17, 2015 at 02:03:34PM +0100, Andreas Kretschmer wrote:
> Peter Hicks wrote:
>
> > All,
> >
> > I have a Rails application on 9.3 in which I want to enforce a unique
> > index on a set of fields, one of which includes a NULL-able column.
> >
> > According to
> > http://www.postgre
Peter Hicks wrote:
> All,
>
> I have a Rails application on 9.3 in which I want to enforce a unique
> index on a set of fields, one of which includes a NULL-able column.
>
> According to
> http://www.postgresql.org/docs/9.3/static/indexes-unique.html, btree
> indexes can't handle uniqueness
Hi John
On 17/01/15 12:39, John McKown wrote:
I read the above. As I understand it, you can have a unique index on
a column which is NULL-able. That will guarantee that all the non-NULL
values are unique. What it will not guarantee is that there will be at
most one NULL value in the indexed c
On Sat, Jan 17, 2015 at 6:27 AM, Peter Hicks
wrote:
> All,
>
> I have a Rails application on 9.3 in which I want to enforce a unique
> index on a set of fields, one of which includes a NULL-able column.
>
> According to http://www.postgresql.org/docs/9.3/static/indexes-unique.html,
> btree indexe
All,
I have a Rails application on 9.3 in which I want to enforce a unique
index on a set of fields, one of which includes a NULL-able column.
According to
http://www.postgresql.org/docs/9.3/static/indexes-unique.html, btree
indexes can't handle uniqueness on NULL columns, so I'm looking for
