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Relational Algebra

Relational Algebra. Lecture #9. Querying the Database. Goal: specify what we want from our database Find all the employees who earn more than $50,000 and pay taxes in Champaign-Urbana. Could write in C++/Java, but bad idea Instead use high-level query languages:

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Relational Schema Design (end) Relational Algebra

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Lecture 13: Relational Decomposition and Relational Algebra

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Relational Algebra

Relational Algebra. Relational Algebra. Formalism for creating new relations from existing ones Its place in the big picture:. Declartive query language. Algebra. Implementation. Relational algebra Relational bag algebra. SQL, relational calculus. Relational Algebra. Five operators:

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