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 language for data manipulation in this data model. It formed the inspiration for the database-query languages QUEL and SQL, of which the latter, although far less faithful to the original relational model and calculus, is now the de facto standard database-query language; a dialect of SQL is used by nearly every relational-database-management system. Michel Lacroix and Alain Pirotte proposed domain calculus, which is closer to first-order logic and together with Codd showed that both of these calculi (as well as relational algebra) are equivalent in expressive power. Subsequently, query languages for the relational model were called relationally complete if they could express at least all of these queries.
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Tuplecalculus 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...
, with or without an index. Originally based upon relational algebra and tuplerelationalcalculus, SQL consists of many types of statements, which may...
In computer science, domain relationalcalculus (DRC) is a calculus that was introduced by Michel Lacroix and Alain Pirotte as a declarative database...
of tuples, grouped into relations. A database organized in terms of the relational model is a relational database. The purpose of the relational model...
An n-tuple is a tuple of n elements, where n is a non-negative integer. There is only one 0-tuple, called the empty tuple. A 1-tuple and a 2-tuple are...
extracts only the specified attributes from a tuple or set of tuples. The join operation defined for relational databases is often referred to as a natural...
technique for relational databases Relational concept, a set of mathematically defined tuples in tuplerelationalcalculusRelational model, a database...
construction Relational calculusRelational database Relational model Theory of relations Triadic relation Tuplerelationalcalculus SQL Datalog Codd's theorem...
QUEL is a relational database query language, based on tuplerelationalcalculus, with some similarities to SQL. It was created as a part of the Ingres...
In the relational model of databases, a primary key is a specific choice of a minimal set of attributes (columns) that uniquely specify a tuple (row) in...
; Fagin, Ronald (2012). "A Normal Form for Preventing Redundant Tuples in Relational Databases" (PDF). Proceedings of the 15th International Conference...
computing: Join (relational algebra), a binary operation on tuples corresponding to the relation join of SQL Join (SQL), relational join, a binary operation...
invented by Robin Milner Relationalcalculus, a calculus for the relational data model Domain relationalcalculusTuplecalculus, inspired the SQL language...
operators. Relationalcalculus – consists of two calculi, the tuplerelationalcalculus and the domain relationalcalculus, that are part of the relational model...
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...
subset of the Cartesian product X1 × ... × Xn; that is, it is a set of n-tuples (x1, ..., xn), each being a sequence of elements xi in the corresponding...
(X,Y,G)} , as normally a proper class cannot be a member of an ordered tuple; or of course one can identify the binary relation with its graph in this...
worlds. Thus, the relational semantics interprets formulas of modal logic using models defined as follows. A relational model is a tuple M = ⟨ W , R , V...
and the manipulation part is expressed using the relational algebra, tuplecalculus and domain calculus. A data model instance is created by applying a...
logic Relational model, an approach to managing data Relation (database), a component of a relational database Relational algebra Relationalcalculus Relational...
Fril is a programming language for first-order predicate calculus. It includes the semantics of Prolog as a subset, but takes its syntax from the micro-PROLOG [es]...
queries, because they are the equivalent, in the relationalcalculus, of the equi-join queries in the relational algebra (when selecting all columns of the...
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