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

In relational algebra, a projection is a unary operation written as Π a 1 , . . . , a n ( R ) {\displaystyle \Pi _{a_{1},...,a_{n}}(R)} , where R {\displaystyle...

In relational algebra, a rename is a unary operation written as ρ a / b ( R ) {\displaystyle \rho _{a/b}(R)} where: R is a relation a and b are attribute...

In relational algebra, a selection (sometimes called a restriction in reference to E.F. Codd's 1970 paper and not, contrary to a popular belief, to avoid...

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 database management system used...

algebraic structures, such as groups, rings, etc. Elementary algebra, i.e. "high-school algebra" Abstract algebra Linear algebra Relational algebra Universal...

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

= { x ∈ X : x ∼ a } . {\displaystyle [a]=\{x\in X:x\sim a\}.} In relational algebra, if R ⊆ X × Y {\displaystyle R\subseteq X\times Y} and S ⊆ Y × Z {\displaystyle...

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

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

well as relational algebra) are equivalent in expressive power. Subsequently, query languages for the relational model were called relationally complete...

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

rename a file in various operating systems Rename (relational algebra), unary operation in relational algebra Company renaming, rename of a product Name change...

Universal algebra (sometimes called general algebra) is the field of mathematics that studies algebraic structures themselves, not examples ("models")...

theoretical properties that larger classes of queries (e.g., the relational algebra queries) do not share. The conjunctive queries are the fragment of...

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

Look up relational in Wiktionary, the free dictionary. Relational may refer to: Relational capital, the value inherent in a company's relationships 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...

various applications in computer science (such as in the theory of relational algebra), philosophy, formal semantics, and evolutionary dynamics. Its foundational...

operator in mathematics a plane the unary projection operation in relational algebra the Pi function, i.e. the Gamma function when offset to coincide with...

vector onto a straight line Projection (relational algebra), a type of unary operation in relational algebra Projective geometry, the study of geometric...

function Relational algebra Representation theory Root of unity Scheme theory Sigma-algebra Singular value decomposition Spectral theory Symmetric algebra Symmetry...

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

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

Octonion algebra Pre-Lie algebra Poisson algebra Process algebra Quadratic algebra Quaternion algebra Rees algebra Relation algebra Relational algebra Rota–Baxter...

data Relation (database), a component of a relational database Relational algebra Relational calculus Relational database, a digital database Relationships...

programming; relational algebra used in databases; discrete and finite versions of groups, rings and fields are important in algebraic coding theory;...

semantics and implementation are based on reshaped relational algebra (RRA), a relational algebra that is adapted to the entity–relationship model and...

NoSQL (originally referring to "non-SQL" or "non-relational") is an approach to database design that focuses on providing a mechanism for storage and retrieval...