117 search results - page 2 / 24 » Relation Algebra Operations on Formal Contexts |
PEPM
2010
ACM
14 years 1 months ago
2010
ACM
We show how to efficiently evaluate generic map-filter-product queries, generalizations of select-project-join (SPJ) queries in relational algebra, based on a combination of two...
ICDE
1994
IEEE
13 years 9 months ago
1994
IEEE
The relational data model is based on sets of tuples, i.e. it does not allow duplicate tuples in a relation. Many database languages and systems do require multi-set place, the hi...
JLP
2011
12 years 11 months ago
2011
The family of domain algebras provide an elegant formal system for automated reasoning about programme verification. Their primary models are algebras of relations, viz. represen...
BIRTHDAY
2009
Springer
13 years 11 months ago
2009
Springer
Any mapping S : C → K, where K is a field and C = (C, Σ) is a Σ-algebra, is called a KC-series. These series are natural generalizations of both formal series on strings over...
CJ
2006
13 years 5 months ago
2006
Operations on spatial objects have much individuality. As a consequence, the spatial data modelling approaches, which have been proposed, have to consider either data types of the...