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Reference.org
Relational database
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<p>A relational database (RDB) is a <a href="/facts/Database/VYcpkevb">database</a> based on the <a href="/facts/Relational_model/VFf4dDIU">relational model</a> of data, as proposed by <a href="/facts/E._F._Codd/QCSbPYkK">E. F. Codd</a> in 1970. </p><p>A Relational <a href="/facts/Database_Management_System/VYcpkevb">Database Management System</a> (RDBMS) is a type of database management system that stores data in a structured <a href="/facts/Content_format/TtPU7QDo">format</a> using <a href="/facts/Row_(database)/PIpv7c9e">rows</a> and <a href="/facts/Columns/NDtghP75">columns</a>. </p><p>Many relational database systems are equipped with the option of using <a href="/facts/SQL/UjQLJcYm">SQL</a> (Structured Query Language) for querying and updating the database. </p>