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Chapter 6 The Relational Algebra and Relational Calculus

Chapter 6 The Relational Algebra and Relational Calculus. Chapter 6 Outline. Unary Relational Operations: SELECT and PROJECT Relational Algebra Operations from Set Theory Binary Relational Operations: JOIN and DIVISION Additional Relational Operations. Chapter 6 Outline (cont’d.).

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Relational Algebra

Relational Algebra. Procedural language Six basic operators select:  project:  union:  set difference: – Cartesian product: x rename:  closure. Select Operation. Notation:  p ( r ) p : selection predicate Defined as:  p ( r ) = { t | t  r and p(t) }

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Homework 2

Homework 2. In the docs folder of your Berkeley DB, have a careful look at documentation on how to configure BDB in main memory. A new description of Homework 2 is posted.

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