Relational Database

RDBMS is a type of software that helps users to create, update, manage, and access relational databases. Relational databases organize data into tables, which consist of rows and columns. Each column represents a specific attribute of the data, while each row represents a specific instance of that data.

RDBMS allow users to interact with the database using SQL, which is a standard language for managing and manipulating relational databases. SQL allows users to perform a variety of operations on the database, including adding, updating, and deleting data, as well as retrieving data based on specific criteria.

RDBMS also provide a range of features to ensure data integrity, such as enforcing data constraints, supporting transactions, and providing backup and recovery capabilities. Additionally, RDBMS systems often provide tools for managing the database, such as user interfaces for creating and modifying tables and views, and monitoring tools for optimizing database performance.

Security is a paramount aspect of managing databases. Even at the introductory level, it’s crucial to be aware of the basic security measures:

Authentication and Authorization: Ensuring that only authorized users have access to the database.
Role-Based Access Control: Assigning permissions based on roles within the organization.
Data Encryption: Protecting sensitive data both at rest and in transit.

There are dozens of RDBMS, used in nowadays projects. But most widespread are:

PostgreSQL: A Powerful, open source object-relational database system.
SQLite: A C-library that implements a small, full featured SQL database engine.
MySQL: A fast, multithread, multi-user, and robust SQL database server.