Re: Getting the table ID

On Mon, Jul 18, 2022 at 8:11 PM Igor Korot <ikorot01(at)gmail(dot)com> wrote:

>
> There is a pg_namespace table - is this where the schema should come from?
> If yes - how?
> Looking at that table I don't see any unique fields...
> Or is this something that is hidden?
>

Catalogs don't have all of the same metadata that user-space tables have.

"namespace" is the historical and internally used label for what we present
to users as "schema"

>
> In fact I'm trying to run following query:
>
> SELECT c.oid FROM pg_class c, pg_namespace nc WHERE nc.oid =
> c.relnamespace AND c.relname = ? AND nc.nspname = ?;
>

Then either relname or nspname caused the records to filter out because the
join part of that where clause is correct.

I suggest you experiment using psql and literals so you can provide both
actual queries and results more easily. The whole self-contained script
thing is very helpful.

You can also learn quite a bit by echoing queries in psql then using the
various description metacommands that query these same catalogs - thus
echoing the queries psql itself uses to answer this same question.

David J.