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Relational databases are a type of database management system (DBMS) that stores and organizes data in tables, which are related to each other through keys. They are based on the relational model introduced by Edgar F. Codd in 1970, where data is stored in rows and columns, and relationships between data in different tables are established through foreign keys. A key feature of relational databases is the ability to use structured query language (SQL) to manipulate and query data. This model enables efficient data storage and retrieval while ensuring the integrity of the data through rules and constraints.

https://en.wikipedia.org/wiki/Relational_database

The relational database structure allows for the use of complex queries to retrieve and manipulate data in a highly efficient manner. One of the major advantages of using relational databases is the ability to handle large amounts of structured data. Tables can have a variety of fields, or columns, each holding specific data types, such as strings, integers, dates, and more. By organizing data into related tables, these databases can support a wide range of applications from business operations to web services, ensuring that data is stored in a logical and easily accessible format. Popular examples of relational databases include MySQL, PostgreSQL, and Oracle.

https://www.oracle.com/database/what-is-database.html

Another key feature of relational databases is the ability to ensure data integrity through constraints and rules. Constraints like primary keys, foreign keys, and unique constraints prevent data anomalies and enforce the relationships between tables. For instance, a primary key uniquely identifies a row in a table, while a foreign key links rows in different tables. By maintaining relationships and ensuring data consistency, relational databases provide a solid foundation for handling transactional systems, analytics, and business-critical applications.

https://www.dataversity.net/what-are-relational-databases-and-why-are-they-important/

Snippet from Wikipedia: Relational database

A relational database (RDB) is a database based on the relational model of data, as proposed by E. F. Codd in 1970.

A Relational Database Management System (RDBMS) is a type of database management system that stores data in a structured format using rows and columns.

Many relational database systems are equipped with the option of using SQL (Structured Query Language) for querying and updating the database.

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