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PostgreSQL is an advanced, open-source object-relational database management system (ORDBMS) that is highly customizable and extensible. It is designed to handle a wide range of workloads, from small single-machine applications to large internet-facing applications with many concurrent users.
Some of the key features and benefits of PostgreSQL include:

A robust and powerful SQL engine that supports a wide range of SQL features and data types, including advanced data types such as JSON and XML. Support for a variety of indexing methods, including B-tree, hash, and GIN indexes, which can be used to optimize query performance. Support for ACID (Atomicity, Consistency, Isolation, Durability) transactions, which ensure data integrity and consistency in the face of concurrent updates and system failures. A flexible and extensible architecture that allows users to write custom functions and data types in a variety of languages, including C, C++, Python, and more. A large and active community of users and developers, who contribute to the development and maintenance of the software, as well as a wide range of third-party extensions and tools that can be used to enhance PostgreSQL's capabilities. Overall, PostgreSQL is a powerful and versatile database system that is well-suited for a wide range of applications and workloads. It is a popular choice among developers and organizations that require a robust, scalable, and customizable database solution.

How to install PostgreSQL under linux os ?

Install the PostgreSQL package using your Linux distribution's package manager. For example, on Ubuntu or Debian, you can use the apt command to install the postgresql package, like this:

sudo apt update
sudo apt install postgresql

This will install the latest version of PostgreSQL and all required dependencies on your system.
Once the installation is complete, start the PostgreSQL server by running the systemctl command. For example, on Ubuntu or Debian, you can use the following command to start the PostgreSQL service:

sudo systemctl start postgresql

This will start the PostgreSQL server and make it available to connect to.

To connect to the PostgreSQL server, you will need to use a client program, such as the psql command-line tool or a graphical client application. The psql command-line tool is included with the PostgreSQL installation, and can be used to connect to the server and execute SQL commands.
To connect to the PostgreSQL server using psql, run the psql command in a terminal or command prompt, and specify the database name and user credentials as arguments. For example, to connect to the "postgres" database as the default "postgres" user, you could use the following command: