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
adrian.klaver@aklaver.com