Re: Document NULL

On 11.11.25 16:34, Álvaro Herrera wrote:
> On 2025-Jun-18, David G. Johnston wrote:
>
>> Version 8.
>>
>> Marking this Ready to Commit in CF 2025-09 (CF PG19-1)
>
> I have rebased this; here's v9. I haven't reviewed it in depth, but
> intend to give it a read and get it pushed sometime in the
> not-too-distant future, so if anybody wants to review it some more, it'd
> be appreciated.

> diff --git a/doc/src/sgml/ddl.sgml b/doc/src/sgml/ddl.sgml
> index 948b9327f24..5ee0391d371 100644
> --- a/doc/src/sgml/ddl.sgml
> +++ b/doc/src/sgml/ddl.sgml
> @@ -168,6 +168,8 @@ DROP TABLE products;
> </para>
> </sect1>
>
> + &nullvalues;

I don't know if this is the right place for this section, if you
follow the flow of the chapters. The proposed text requires that you
already know about DML, queries, data types, and functions, all of
which come much later.

I also don't like the approach of this patch to pull out all of the
null-related information from those various places and collect them
all in one section. I mean, that's interesting if you're really into
studying null and how it affects various parts of SQL. But if I'm
like looking to use IS DISTINCT or whatever specific construct, then I
want to get all the information relevant to that right there, not in
various other places.