An algebra of operations on database relations. Classical relational algebra has relational selection, relational projection, relational join, Cartesian product, union and relational difference; database aggregation requires an extension.
Relational algebra is a formal system for manipulating and querying relational data, which is organized into tables (or relations). It provides a set of operations that can be applied to these tables to retrieve, combine, and transform data in various ways. Relational algebra serves as the theoretical foundation for relational databases and query languages like SQL.
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