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PostgreSQL as HUB

Starting from version 9.3, PostgreSQL has foreign data wrapper (fdw) support. With fdw, PostgreSQL can connect to many external database management system (DBMS), and it can see foreign tables (for example, MySQL or Oracle tables) as local tables. Some of the best know fdws are:

Oracle
MySQL
Informix
Firebird
SQLite
CSV files
Sybase
Microsoft SQL Server
MongoDB
Cassandra

The complete list is available at https://wiki.postgresql.org/wiki/Foreign_data_wrappers.

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