Relational Algebra
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WhyLearnRelationalAlgebra?
In order to find trends and understand the world we live in, people can compare different sets of data.
By finding relationships between differing data, we can find invisible trends in the universe.
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Venn Diagram
Relational Algebra Is the Formal languageThat runs behind SQL.
Selection
σ Selects Column
Projection
π
Selects Rows
Cross Product
XCombine
TwoRelations
Set Difference
−
Elements in One Category but aren't in another category.
Set Difference Example
Union Operator
∪Element in Both
Sets.
Union Operator Example
Intersect Operator
∩
Rename Operator
ρa / b(R)
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