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From: mark bradley <[email protected]>
To: Adrian Klaver <[email protected]>
To: Ron Johnson <[email protected]>
To: pgsql-general <[email protected]>
Subject: Re: Duplicate Key Values
Date: Thu, 13 Mar 2025 16:35:03 +0000
Message-ID: <SJ2PR22MB4328D554FB55EF3C08633273BAD32@SJ2PR22MB4328.namprd22.prod.outlook.com> (raw)
In-Reply-To: <[email protected]>
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>  I'm assuming that by 'simple version' you mean no inheritance.

Anyway, inheritance can be undone via

ALTER TABLE dataset NO INHERIT node;

Now, there are no dups and hopefully it will stay that way.

Best regards,
Mark Brady
amazon.com/author/markjbrady<https://amazon.com/author/markjbrady;
________________________________
From: Adrian Klaver <[email protected]>
Sent: Thursday, March 13, 2025 12:05 PM
To: mark bradley <[email protected]>; Ron Johnson <[email protected]>; pgsql-general <[email protected]>
Subject: Re: Duplicate Key Values

On 3/13/25 08:56, mark bradley wrote:
>  >Postgresql does not assume / default to inheritance.  In text-mode
> clients where you type >in "raw" SQL, you have to explicitly add an
> explicit "INHERITS <parent_table>" clause to the >"CREATE TABLE foo"
> statement.
>
>  >Are you creating the tables via PgAdmin point-and-click?
>
> I am using PgAdmin 4 v9.1.
>
> I think the problem may also be related to the fact that I had
> *node_id* and *node_type *were in both tables from an earlier design and
> Postgres would not let me delete* node_type* from the* dataset* table.

Because it was inherited:

create table node (node_id integer primary key, fld1 varchar);

create table node_1 (node_id integer primary key, node_1_fld boolean)
inherits ( node);

alter table node_1 drop column fld1;
ERROR:  cannot drop inherited column "fld1"

>
> As an experiment, I created a simple version of the same tables from
> scratch without *node_type* in the *dataset* table.  So far, no dups are
> appearing.

I'm assuming that by 'simple version' you mean no inheritance.

>
> Best regards,
> Mark Brady
> _amazon.com/author/markjbrady <https://amazon.com/author/markjbrady>_
> ------------------------------------------------------------------------


--
Adrian Klaver
[email protected]

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