Relational Model and Algebra

Contents

• Relational data mode, Schema vs. instance
• Relational algebra, Selection and exemple
• More on selection, Projection
• Cross product, A note a column ordering
• Derived operator: join, Derived operator: natural join
• Union, Difference, Derived operator: intersection
• Renaming example, Expression tree notation
• Summary of core operators, Summary of derived operators
• An exercise, A trickier exercise
• Classification of relational operators, Why is “ ” needed for “highest”?
• Extensions to relational algebra, Why is r.a. a good query language?
• Relational calculus, Limits of relational algebra

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