Re: Duplicate Key Values

On 3/11/25 12:55, mark bradley wrote:
> It happened again.  Now there are no sequences (although there once was).

Read my previous post and provide the information requested.

Also:

1) Postgres version.

2) Where did you get Postgres from?

>
> Sequence of data reentry:
>
> 1.
> I reentered the /node_id/s in table node as a primary key.
> 2.
> I reentered the datasets, in table /dataset/.
> 3.
> /Node_id/ was already a PK in dataset.
> 4.
> _I set _/_node_id_/_ to also be a foreign key in _/_dataset_/_._
> 5.
> I went back to look at /node/ and see that duplicate key values
> appeared.
>
>
>
>
> Processing nodes are unaffected because I didn't add any data to the
> /processing_node/ table.
>
> Next, I'm going to create a simple database from scratch and see if I
> can duplicate this behavior.
>
> Best regards,
> Mark Brady
> _amazon.com/author/markjbrady <https://amazon.com/author/markjbrady>_
> ------------------------------------------------------------------------
> *From:* Adrian Klaver <adrian(dot)klaver(at)aklaver(dot)com>
> *Sent:* Tuesday, March 11, 2025 3:37 PM
> *To:* mark bradley <markbradyju(at)outlook(dot)com>
> *Cc:* pgsql-general <pgsql-general(at)postgresql(dot)org>
> *Subject:* Re: Duplicate Key Values
> On 3/11/25 11:52, mark bradley wrote:
>>
>>
>>     there is an index on node_id as it is the Primary Key.
>>
>>     Why do you think there is not?
>>
>> My mistake, I misread the output from \d dataset
>>
>>
>>
>> Can you elaborate more on point 3.
>>
>> Are you calling the Foreign Key relationships subclassing?
>>
>>
>> Although I did not explicitly use Postgres to declare inheritance,
>> logically speaking table /dataset/ and /processing _node/ inherit or are
>> subclasses of /node/ because they are subclasses of /node/ in a dataflow
>> diagram.
>>
>>
>> In terms of keys, this is accomplished by having the /node_id/ key in
>> the /node/ table appear as a foreign key and as a primary key in both
>> the /dataset/ and /processing_node/ tables.
>
> You will need to show the schema definitions for:
>
>    node
>    dataset
>    processing_node
>
> Best to do using psql \d <table_name>
>
> Also in from previous \d dataset there where NOT VALID FK definitions.
>
> Did you ever run VALIDATE CONSTRAINT against them?
>
>>
>>
>>
>>     Is there anything in Postgres log at the time you did the above that
>>     showed it did more then a REINDEX?
>>
>>
>> Not that I can tell.
>>
>>
>>
>>
>> Best regards,
>> Mark Brady
>> _amazon.com/author/markjbrady <https://amazon.com/author/markjbrady
> <https://amazon.com/author/markjbrady>>_
>
>
> --
> Adrian Klaver
> adrian(dot)klaver(at)aklaver(dot)com
>

--
Adrian Klaver
adrian(dot)klaver(at)aklaver(dot)com