2022年11月10日(木) 13:41 Igor Korot <ikorot01@gmail.com>:
>
> Hi, ALL,
> According to https://chartio.com/resources/tutorials/how-to-list-databases-and-tables-in-postgresql-using-psql/,
> there are generally 3 system DBs.
>
> However I'm confused with the word general.
> How many system databases can be made on a PG server?
template0 and template1 are the mandatory system databases which
cannot be dropped.
"postgres" is created by default for operational convenience, but is
not essential and can
be removed if you really want to.
Regards
Ian Barwick