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Projection (relational algebra)

Known as: Projection, Projection (database), Projection in relational algebra 
In relational algebra, a projection is a unary operation written as where is a set of attribute names. The result of such projection is defined as… 
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Related topics

Related topics

18 relations
Chase (algorithm)Database modelExistential quantificationExtension (predicate logic)

Broader (1)

Relational algebra

Papers overview

Semantic Scholar uses AI to extract papers important to this topic.
2014
2014
On pairs of generalized and hypergeneralized projections in a Hilbert space
We characterize generalized and hypergeneralized projection i.e. bounded linear operators which satisfy conditions A2 = A∗, or A2… 
2013
2013
Improved area-simulating-volume method for 3D X-ray CT re-projection and back-projection operations
Many studies have reported that the volume-weighting technique has advantages over the ray-tracing method in re-projection… 
2009
2009
On Sonification of Place: Psychosonography and Urban Portrait*
Urban Portrait: Thessaloniki is a sonic art installation by this author, presented at the Lansdown Centre for Electronic Arts of… 
2007
2007
A Conceptual Graph Based Approach to Ontology Similarity Measure
This paper presents a combinatorial, structure based approach to the problem of finding a (di)similarity measure between two… 
2007
2007
A Note on $*$-Clean Rings
A $*$-ring $R$ is called (strongly) $*$-clean if every element of $R$ is the sum of a projection and a unit (which commute with… 
2005
2005
Complemented spaces of operators
Classical results of Kalton are used to study the complementation of the space W(X, Y) of weakly compact operators and the space… 
2005
2005
Double singular integrals: Interpolation and correction
0.1. Interpolation. Let (Ω, μ) be a measure space. Consider an operator Q that acts in all spaces L(μ) with 1 < p < ∞ and is a… 
2000
2000
Sobczyk's theorems from A to B.
Sobczyk's theorem is usually stated as: every copy of c0 inside a separable Banach space is complemented by a projection with… 
1994
1994
Type derivation using the projection operation
Highly Cited
1983
Highly Cited
1983
Critical properties of directed self-avoiding walks
The generating functions and mean displacements of various two-dimensional directed self-avoiding walk models are calculated… 
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