BigDataFr recommends: A Tour of Postgres’ Foreign Data Wrappers

[…] SQL can be a powerful language for reporting. Whether you’re just exploring some data, or generating reports that show month over month revenue growth it’s the lingua franca for data analysis. But, your data isn’t always in a SQL database, even then if you’re using Postgres you can still likely use SQL to analyze, query, even joing with that data. Foreign data wrappers have been around for years in Postgres, but are continuing to mature and be a great option for joining disparate systems.
Overview of foreign data wrappers

If you’re unfamiliar, foreign data wrappers, or FDW, allow you to connect from within Postgres to a remote system. Then you can query them from directly within Postgres. While there is an official Postgres FDW that ships with Postgres itself, that allows you to connect from one Postgres DB to another, there’s also a broad community of others. […]

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By Craig Kerstiens
Source: craigkerstiens.com