What is rational database, etc..

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A relational database is a type of database that organizes data into tables with rows and columns.

A relational database is based on the relational model, which uses tables to store and organize data.
Tables consist of rows and columns, where each row represents a record and each column represents a field or attribute.
Data in a relational database is structured and can be easily accessed and manipulated using SQL (Structured Query Language).
Relationships between tables are established through keys, such as primary keys and foreign keys.
Examples of relational database management systems (RDBMS) include MySQL, Oracle, and SQL Server.

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