| Operator | Symbol on canvas | Predicate |
|---|---|---|
| Selection | σ | Condition |
| Projection | π | Attribute list |
| Natural join | ⋈ | None |
| Theta join | ⋈ | Join condition |
| Semi join | ⋉ | Join condition |
| Anti semi join | ⋉ (anti) | Join condition |
| Difference | — | None |
| Division | / | None |
| Union | ∪ | None |
| Intersection | ∩ | None |
| Result | R | None |