Relational Algebra Rolf Fagerberg DM505, Spring 2006, 4th Quarter - PowerPoint PPT Presentation

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Relational Algebra Rolf Fagerberg DM505, Spring 2006, 4th Quarter 1 Algebra Algebra: operands (values) and operators (ways of generating new values from old). Example: Arithmetic algebra Operands: Numbers Operators: Unary: Sign change

Relational Algebra Rolf Fagerberg DM505, Spring 2006, 4th Quarter 1
Algebra Algebra: operands (values) and operators (ways of generating new values from old). Example: Arithmetic algebra Operands: Numbers Operators: Unary: Sign change Binary: Addition, subtraction, multiplication, division. Expressions: 4 · ( − (2 · (3 + 5)) Can be viewed as expression trees. 2
Relational algebra Codd, 1970 Operands: Relations Operators: Unary: Selection ( σ ), projection ( π ), renam- ing ( ρ ) Binary: Set operations ( ∩ , ∪ , \ ), cross prod- uct ( × ), various joins ( ⊲ ⊳ ), division ( / ) Again: Expressions and expression trees. Query in relational model = expression of relational algebra. SQL (query part) based very much on relational algebra. 3

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