Relational Algebra
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Relational algebra - The relational algebra is a set of operations that manipulate relations as they are defined in the relational model and as such describes part of the data manipulation aspect of this data model. Because of their algebraic properties these operations are often used in database query optimization as an intermediate representation of a query to which certain rewrite rules can be applied to obtain a more efficient version of the query.
Selection (relational algebra) - In relational algebra, a selection is a unary operation written as
Projection (relational algebra) - In relational algebra, a projection is a unary operation written as \pi_{a_1, ...,a_n}( R ) where a_1,...
Relational calculus - The relational calculus refers to the two calculi, the tuple calculus and the domain calculus, that are part of the relational model for databases and that provide a declarative way to specify database queries. This in contrast to the relational algebra which is also part of the relational model but provides a more procedural way for specifying queries.
relationalalgebra
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