Relational Algebra
- The fundamental operations on tables (relations).
- Underlies the semantics of SQL.
- The basis of query optimization.
Algebra
- A set of operations on values of some type, which yield values of the same type.
- E.g. , , , and .
- Numbers → numbers.
Relational Algebra
- An algebra for relations, (i.e. tables).
- Set-oriented: a relation is a set.
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