Relational Algebra

Binary Operators

• ∪ set union
• ∩ set intersection
• - set difference
• ⨯ carthesian product

Unary Operators

• π projection
• σ restriction
• ρ rename

Joins

• ⋈ natural join
• θ-join & equijoin
• ⋉ & ⋊ semijoin
• ▷ antijoin
• ÷ division