Re: cataloguing NOT NULL constraints

From: Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org>
To: Dean Rasheed <dean(dot)a(dot)rasheed(at)gmail(dot)com>
Cc: Peter Eisentraut <peter(at)eisentraut(dot)org>, pgsql-hackers(at)lists(dot)postgresql(dot)org
Subject: Re: cataloguing NOT NULL constraints
Date: 2023-07-24 17:17:33
Message-ID: 20230724171733.n7ivcjsq7oo4p6xz@alvherre.pgsql
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While discussing the matter of multiple constraints with Vik Fearing, I
noticed that we were throwing an unnecessary error if you used


That would die with "redundant NOT NULL declarations", but current
master doesn't do that; and we don't do it for UNIQUE UNIQUE either.
So I modified the patch to make it ignore the dupe and create a single
constraint. This (and rebasing to current master) are the only changes
in v15.

I have not changed the psql presentation, but I'll do as soon as we have
rough consensus on what to do. To reiterate, the options are:

1. Don't show the constraint names. This is what the current patch does

2. Show the constraint name in \d+ in the "nullable" column.
I did this early on, to much booing.

3. Show the constraint name in \d++ (a new command) tabular output

4. Show the constraint name in the footer of \d+
I also did this at some point; there are some +1s and some -1s.

5. Show the constraint name in the footer of \d++

Many thanks, Dean, for the discussion so far.

Álvaro Herrera PostgreSQL Developer —
Bob [Floyd] used to say that he was planning to get a Ph.D. by the "green
stamp method," namely by saving envelopes addressed to him as 'Dr. Floyd'.
After collecting 500 such letters, he mused, a university somewhere in
Arizona would probably grant him a degree. (Don Knuth)

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