PostgreSQL is the most popular Open Source Relational SQL database management system. PostgreSQL is one of the best RDBMS being used for developing web-based software applications.
Version PostgreSQL 10.15
In order to use Postgres, log into postgres account.
You can do that by typing:
sudo -i -u postgres
You will be asked for your normal user password and then will be given a shell prompt for the postgres user
You can get a Postgres prompt immediately by typing: psql
The TCP port the server listens on 5432 by default. It is not opened on Public interface for security

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