4397 search results - page 190 / 880 » Relational Algebra Operations |
288
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SIGMOD
2009
ACM
16 years 6 months ago
2009
ACM
Keyword search in relational databases (RDBs) has been extensively studied recently. A keyword search (or a keyword query) in RDBs is specified by a set of keywords to explore the...
138
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LICS
2006
IEEE
16 years 16 days ago
2006
IEEE
Abstract. We describe simple algebraic and combinatorial characterisations of finite relational core structures admitting finitely many obstructions. As a consequence, we show th...
142
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ATVA
2005
Springer
16 years 2 days ago
2005
Springer
Abstract. In this paper, we develop a syntactical version of elaborated reductions for high-level Petri nets. These reductions simplify the model by merging some sequential transit...
179
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LICS
1994
IEEE
15 years 10 months ago
1994
IEEE
In this paper we study the interaction of subtyping and parametricity. We describe a logic for a programming language with parametric polymorphism and subtyping. The logic support...
166
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DEXA
1994
Springer
15 years 10 months ago
1994
Springer
We describe a functional database language OR-SML for handling disjunctive information in database queries, and its implementation on top of Standard ML 12]. The core language has ...