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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