I am currently looking at MongoDB and ArangoDB as the database for our web application, but neither appear to support cross-database joins, does anyone know if there is such a document database that supports this please?
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You could try PostgreSQL? Using the postgres_fdw (foreign data wrapper) and the querying capabilities with JSONB?– Vérace - Слава УкраїніApr 9, 2021 at 14:20
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You can do it postgres
Update as of 9.3
You can now use the new postgres_fdw (foreign data wrapper) to connect to tables in any Postgres database - local or remote.
also you can use dblink functionality but it isn't part of the default PostgreSQL install, but you can add it in.- dblink.
