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The postgres_fdw module provides the foreign-data wrapper postgres_fdw, which can be used to access data stored in external PostgreSQL servers.

First, enable the extension:

CREATE EXTENSION postgres_fdw;

To connect to a remote YSQL or PostgreSQL database, create a foreign server object. Specify the connection information (except the username and password) using the OPTIONS clause:

CREATE SERVER my_server FOREIGN DATA WRAPPER postgres_fdw OPTIONS (host 'host_ip', dbname 'external_db', port 'port_number');

Specify the username and password using CREATE USER MAPPING:

CREATE USER MAPPING FOR mylocaluser SERVER my_server OPTIONS (user 'remote_user', password 'password');

You can now create foreign tables using CREATE FOREIGN TABLE and IMPORT FOREIGN SCHEMA:

CREATE FOREIGN TABLE table_name (colname1 int, colname2 int) SERVER my_server OPTIONS (schema_name 'schema', table_name 'table');
IMPORT FOREIGN SCHEMA foreign_schema_name FROM SERVER my_server INTO local_schema_name;

You can execute SELECT statements on the foreign tables to access the data in the corresponding remote tables.