Can PostgreSQL Execute Cross-Database Queries?

Can PostgreSQL perform cross-database queries?

One limitation of PostgreSQL is the inability to perform cross-database queries. This is evident from the error message "Cross-database references not implemented" referenced in the initial query.

For data that spans multiple database partitions, an alternative exists: postgres_fdw (Foreign Data Wrapper). This makes it possible to connect to tables in any PostgreSQL database, whether local or remote.

Old PostgreSQL version notes:

For versions prior to 9.3, a function named dblink can be used. This feature is distributed with PostgreSQL, but users may need to install the postgresql-contrib package. It should be noted that older versions of PostgreSQL are no longer supported.

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