postgresql-client-11 - 11.16-0+deb10u1 main

This package contains client and administrative programs for
PostgreSQL: these are the interactive terminal client psql and
programs for creating and removing users and databases.
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This is the client package for PostgreSQL 11. If you install
PostgreSQL 11 on a standalone machine, you need the server package
postgresql-11, too. On a network, you can install this package on
many client machines, while the server package may be installed on
only one machine.
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PostgreSQL is an object-relational SQL database management system.