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The document discusses relational algebra and SQL. It begins by introducing Edgar Codd, the father of the relational model. It then defines relational algebra as a language based on operators that map domain values to other domain values. The basic relational algebra operators are select, project, union, set difference, and Cartesian product. Derived operators include set intersection, division, and join. Relational algebra is procedural while SQL is declarative. Examples are provided to illustrate relation

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EN