| The Relational Algebra |
The relational algebra is a procedural query language.
- Six fundamental operations:
- select (unary)
- project (unary)
- rename (unary)
- cartesian product (binary)
- union (binary)
- set-difference (binary)
- Several other operations, defined in terms of the fundamental
operations:
- set-intersection
- natural join
- division
- assignment
- Operations produce a new relation as a result.
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