In relational algebra, a join is a binary operation, written as R ⋈ S {\displaystyle R\bowtie S} where R {\displaystyle R} and S {\displaystyle S} represent...

In database theory, relational algebra is a theory that uses algebraic structures for modeling data and defining queries on it with well founded semantics...

table. The operation corresponds to a join operation in relational algebra. Informally, a join stitches two tables and puts on the same row records with...

Join (sigma algebra), a refinement of sigma algebras Join (algebraic geometry), a union of lines between two varieties In computing: Join (relational...

database. The relational calculus is similar to the relational algebra, which is also part of the relational model: While the relational calculus is meant...

A relational database (RDB) is a database based on the relational model of data, as proposed by E. F. Codd in 1970. A Relational Database Management System...

native Win32 ports of common GNU Unix-like utilities. Textutils Join (SQL) Relational algebra List of Unix commands printf – Shell and Utilities Reference...

algebra, an interior algebra is a certain type of algebraic structure that encodes the idea of the topological interior of a set. Interior algebras are...

variables. Its computational expressiveness is equivalent to that of relational algebra. Let (A, B, C) mean (Rank, Name, ID) in the Enterprise relation and...

The relational model (RM) is an approach to managing data using a structure and language consistent with first-order predicate logic, first described in...

abstract algebra. It consists of a partially ordered set in which every pair of elements has a unique supremum (also called a least upper bound or join) and...

them into a single iterator. Merge (revision control) Join (relational algebra) Join (SQL) Join (Unix) Skiena, Steven (2010). The Algorithm Design Manual...

Conjunctive queries also correspond to select-project-join queries in relational algebra (i.e., relational algebra queries that do not use the operations union...

"non-relational") refers to a type of database design that stores and retrieves data differently from the traditional table-based structure of relational databases...

directed graphs, where objects reference each other. Relational is tuples in tables with relational algebra. Tuples are data fields grouped into a "row" with...

Database normalization is the process of structuring a relational database in accordance with a series of so-called normal forms in order to reduce data...

form used in relational database normalization which extends the relational algebra and generalizes relational operators (such as join) to support interval...

full complex algebra or power algebra. Every (normal) Boolean algebra with operators can be represented as a field of sets on a relational structure in...

mathematics and mathematical logic, Boolean algebra is a branch of algebra. It differs from elementary algebra in two ways. First, the values of the variables...

i.e., with or without an index. Originally based upon relational algebra and tuple relational calculus, SQL consists of many types of statements, which...

QUEL was considered at the time to run truer to Edgar F. Codd's relational algebra (especially concerning composability), but SQL was easier to parse...

without accessing the stored hierarchy relation". The standard relational algebra and relational calculus, and the SQL operations based on them, are unable...

Universal algebra studies structures that generalize the algebraic structures such as groups, rings, fields and vector spaces. The term universal algebra is...

list of instances of information algebras: Relational algebra: The reduct of a relational algebra with natural join as combination and the usual projection...

In database theory, Imieliński–Lipski algebra is an extension of relational algebra onto tables with different types of null values. It is used to operate...

the relational algebra projection operation. AS optionally provides an alias for each column or expression in the SELECT list. This is the relational algebra...

Pearson. p. 461. ISBN 978-0133970777. Maier, David (1983). The theory of relational databases (PDF). Computer Science Press. p. 101. ISBN 0-914894-42-0. Retrieved...

concurrent, communicating processes Relational calculus, a calculus for the relational data model Domain relational calculus Tuple calculus Refinement...

PRIMARY KEY constraint in SQL). The relational model, as expressed through relational calculus and relational algebra, does not distinguish between primary...

D4 supports DDL and DML statements. D4 queries tend to look like relational algebra expressions with written out names of operators. For example: D4 has...