What is the relationship between relational algebra and relational database?

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
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What is the relationship between relational algebra and relational database?

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A relational database is a collection of data items with pre defined relationships between them. 

These items are organized as a set of tables with columns and rows. The columns of the table hold attributes of the data, and each record usually has a value for each attribute, making it easy to establish the relationships among data items.

Relational database systems are expected to be equipped with a query language that can assist its users to query the database instances.

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