| From: | Laurenz Albe <laurenz(dot)albe(at)cybertec(dot)at> |
|---|---|
| To: | Kirk Parker <khp(at)equatoria(dot)us>, pgsql-docs(at)lists(dot)postgresql(dot)org |
| Subject: | Re: Nulls Not Distinct in Unique Indexes secton |
| Date: | 2023-03-16 19:48:58 |
| Message-ID: | 6f76cd51846f0a8f02df91cc252a7ebcf8c6186f.camel@cybertec.at |
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| Lists: | pgsql-docs |
On Tue, 2023-03-14 at 08:24 -0700, Kirk Parker wrote:
> The Unique Indexes section (https://www.postgresql.org/docs/15/indexes-unique.html)
> does not mention the new NULLS [ NOT ] DISTINCT capability of indexes
> (https://www.postgresql.org/docs/15/sql-createindex.html) and it probably should.
>
> Specifically, it has the exact wording from previous versions (emphasis added):
>
> When an index is declared unique, multiple table
> rows with equal indexed values are not allowed.
> *Null values are not considered equal*.
>
> We should consider adding "unless the NULLS NOT DISTINCT clause is used when
> creating the index", or something to that effect.
+1
Here is a patch for that.
Yours,
Laurenz Albe
| Attachment | Content-Type | Size |
|---|---|---|
| 0001-Mention-NULLS-NOT-DISTINCT-in-the-SQL-documentation.patch | text/x-patch | 1.2 KB |
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