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Regardless of which method will work best for you, you can now query across your different PostgreSQL databases with ease. In my experience, SQL queries takes way more time to execute, if you're joining more foreign tables. However, the drawback is that postgres_fdw will work on earlier PostgreSQL versions, which means you'll need to spin up a new PostgreSQL deployment in order to use postgres_fdw. The foreign data wrapper establishes a permanent connection, which could be advantageous or disruptive, depending on your needs. Postgres foreign data wrapper is new to PostgreSQL, more SQL standard compliant compared to dblink, and provides improved performance over dblink connections, so it tends to be the recommended method. Luckily you don't need to worry about that anymore! Thoughts Trying to run a query like this without having the foreign data wrapper set up would yield a “cross-database references are not implemented” error. To use this, you'll need to activate this once on your database. The extension ships with PostgreSQL and permits you to query, update, insert, or delete data in one PostgreSQL database from a different one. Postgres_fdw extension is essentially a PostgreSQL-to-PostgreSQL connector for PostgreSQL databases, which may be the same or different hosts. The question is: How can you make PostgreSQL support cross database querying? The answer is pretty simple: postgres_fdw. However, if you’re not, it might still work but this will depend on your server setup. NOTE: I use Amazon RDS for PostgreSQL instances – so these instructions will work for you if you’re using same. I figured I’d take a moment to walk you through setting up your database to enable you take advantage of this cool feature, that you may find interesting (if you’re not already using it). I’ve been using PostgreSQL for the past few months.

1 Peter, if you ever read this update, thanks for the suggestion. 21 December 2020: Allowing a non-superuser to perform cross-database querying.902 words Cross Database Querying in PostgreSQL.