How do I merge database Oracle and Postgres into a Select? - postgresql

I have DBeaver and 2 DB connections, Oracle and Postgres. I would like to know how do I use the 2 databases in my select?

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Query data between two servers of postgres?

I am trying to query data between two servers of postgres. One is posgtres RDS of AWS and one is a aurora DB postgres. This posgtres RDS of AWS is a backup of the main aurora DB. I need to copy few rows from this backup to the main aurora Db instance.
i tried using dblink to connect two servers but it is not successful
I tried using dblink and it did not work. My postgres version is latest and above 13.6 and it is aurora serverless V2.

Is there any way to sync on premise oracle table data to a table in Aurora postgres RDS?

I've migrated a On premise Oracle to Aurora Postgres on AWS RDS. my migration process is described in the below image.
I'm looking for an option to sync data from on prem oracle to aurora postgres (Something like, if one row inserted/updated in particular table, that data should come and update/insert in aurora postgres table).
Is it possible ?

Yes you'll want to use the DMS (Database Migration Service) which can do continuous data replication from source to target DB's
https://aws.amazon.com/dms/

fetch data from postgreSQl db to oracle Db using PlsQl

We have a PostgreSQL which is installed in openshift container DB.
I wanted to fetch data from few tables in Postgres Db(PostgreSQL) and load it to Oracle Db.
Please give me some idea on how to connect and fetch the data from Postgres.
Thanks!

Inserting differntial data into postgresql table from db2 table trough trigger

I am looking the differential data load from db2 tables to PostgreSQL. Is there any free tool? or how I can write the trigger to connect two databases?
will db2_fdw in PostgreSQL will help me to do this?

You can't write to nicknames in triggers in Db2.
You may use SQL Replication to a federated data source (PostgreSQL in you case) depending on your Db2 version.
11.5 Federation for PG
11.1 Federation for PG

Insert records to Heroku Postgres database using a rails script

I need to update a dababase from an other database... For this I need to search in existing database if the records exists, if not add... One of the database is locally stored in my computer, and the other one is on heroku... But I don't know how to access heroku database from my computer to create the inserts and to query if I have to insert or not...
Any idea how can I do something like this?

You can connect via any DB tool, e.g. Oracle SQL Developer with Postgres JDBC connector, to a Heroku Postgres DB. The parameters are listed in the GUI of postgres.heroku.com for your instance.