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How to Configure Foreign Data Wrapper in PostgreSQL

A foreign data wrapper for PostgreSQL is a plugin that allows PostgreSQL to access and query data from external sources as if it were a regular table in a local PostgreSQL database. This allows users to perform joins and other operations on external data using SQL, as well as integrate external data with local data in their queries. This can be useful for a variety of purposes, such as integrating data from multiple sources, or accessing data from external sources that are not natively supported by PostgreSQL.

To configure a foreign data wrapper for PostgreSQL, you will need to perform the following steps:

Install the foreign data wrapper extension for PostgreSQL. This can typically be done using the CREATE EXTENSION command. For example:
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CREATE EXTENSION postgres_fdw;

Create a foreign server object that represents the external data source you want to access. This can be done using the CREATE SERVER command. For example:
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