public inbox for [email protected]  

help / color / mirror / Atom feed

From: Tom Lane <[email protected]>
To: Bruce Momjian <[email protected]>
Cc: [email protected]
Subject: Re: pgsql: doc: add examples of creative use of unique expression indexes
Date: Fri, 10 Apr 2020 19:21:29 -0400
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>
	<[email protected]>
	<[email protected]>

Bruce Momjian <[email protected]> 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 might
> be required for compatibility with other databases.  Attached is an
> updated patch which removes the previous commit but adds a mention of
> this.

The single-null thing is probably a useful example, but please make
it an actual separate example, or at least its own para outside the
existing <example> sections.

Also, the existing example demonstrating that seems overcomplicated;
why not just

    create unique index ... (1) where (foo is null);

			regards, tom lane

view thread (9+ messages)  latest in thread

reply

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Reply to all the recipients using the --to and --cc options:
  reply via email

  To: [email protected]
  Cc: [email protected], [email protected], [email protected]
  Subject: Re: pgsql: doc: add examples of creative use of unique expression indexes
  In-Reply-To: <[email protected]>

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

This inbox is served by agora; see mirroring instructions
for how to clone and mirror all data and code used for this inbox