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The relational calculus consists of two calculi, the tuple relational calculus and the domain relational calculus, that is part of the relational model for databases and provide a declarative way to specify database queries. The raison d'être of relational calculus is the formalization of query optimization, which is finding more efficient manners to execute the same query in a database.
The relational calculus is similar to the relational algebra, which is also part of the relational model: While the relational calculus is meant as a declarative language that prescribes no execution order on the subexpressions of a relational calculus expression, the relational algebra is meant as an imperative language: the sub-expressions of a relational algebraic expression are meant to be executed from left-to-right and inside-out following their nesting.
Per Codd's theorem, the relational algebra and the domain-independent relational calculus are logically equivalent.
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The relationalcalculus consists of two calculi, the tuple relationalcalculus and the domain relationalcalculus, that is part of the relational model...
Tuple calculus is a calculus that was created and introduced by Edgar F. Codd as part of the relational model, in order to provide a declarative database-query...
In computer science, domain relationalcalculus (DRC) is a calculus that was introduced by Michel Lacroix and Alain Pirotte as a declarative database...
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A relational database (RDB) is a database based on the relational model of data, as proposed by E. F. Codd in 1970. A database management system used...
programming. Whereas relational databases use a relational calculus or relational algebra, with relational operations, such as union, intersection, set difference...
construction Relational calculusRelational database Relational model Theory of relations Triadic relation Tuple relationalcalculus SQL Datalog Codd's theorem...
technique for relational databases Relational concept, a set of mathematically defined tuples in tuple relationalcalculusRelational model, a database...
a relational view of data, as in relational databases, with a logical view, as in logic programming. Relational databases use a relationalcalculus or...
relationships, using a set of operations based on the mathematical system of relationalcalculus (from which the model takes its name). Splitting the data into a...
known as logical calculi. Domain relationalcalculus, a calculus for the relational data model Functional calculus, a way to apply various types of functions...
logic Relational model, an approach to managing data Relation (database), a component of a relational database Relational algebra Relationalcalculus Relational...
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(for example, spatial databases and engineering databases), the relationalcalculus had limitations. At that time, a reappraisal of the entire database...
operation on SQL and relational database tables join (Unix), a Unix command similar to relational join Join-calculus, a process calculus developed at INRIA...
operators. Relationalcalculus – consists of two calculi, the tuple relationalcalculus and the domain relationalcalculus, that are part of the relational model...
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database (OODBMS) Object–relational database (ORDBMS) Run Book Automation (RBA) Relational model (RDBMS) Comparison of relational database management systems...
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