Re: how to use function from different database

On Thu, Jul 30, 2020 at 5:04 PM Bhupendra Babu <bbabu12(at)gmail(dot)com> wrote:

> I created a generic function (DATEFIFF) login to postgres database using
> psql. ANd I wanted to use across the entire instance , from all other
> databases.
>
> postgres=> CREATE FUNCTION DateDiff (units VARCHAR(30), start_t TIMESTAMP,
> end_t TIMESTAMP)
> How can I use this function across my entire postgresql instance from any
> databases ?
>

So far as a SQL user is concerned Individual databases are isolated from
each other. If you want to use the custom function in a database you need
to issue the "CREATE FUNCTION" command in that database.

See: https://www.postgresql.org/docs/12/manage-ag-overview.html

David J.