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The Relational Algebra

IS 230 (Relational Algebra) - Dr. Yousry Taha . 2. Basic Relational Algebra Operations. A data model must include a set of operations to manipulate the data.A basic set of relational model operations constitute the Relational Algebra.These operations enable

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The Relational Algebra

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    1. The Relational Algebra Dr. Yousry Taha IS230 (This is the instructor’s notes and student has to read the textbook for complete material.)

    2. IS 230 (Relational Algebra) - Dr. Yousry Taha 2 Basic Relational Algebra Operations A data model must include a set of operations to manipulate the data. A basic set of relational model operations constitute the Relational Algebra. These operations enable the user to specify basic retrieval requests which is also a relation. A relational algebra expression is a sequence of relational algebra operations.

    3. IS 230 (Relational Algebra) - Dr. Yousry Taha 3 Basic Relational Algebra Operations (cont) The relational algebra operations are divided into two groups: Set operations (?, n , – , ? ) Operations developed specifically for the relational DB (Select (?) , Project (P), Join ( ) and others). Some additional operations were suggested to perform some common DB requests (aggregations (?), ….).

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