Advanced Data Mining applications require more and more support from relational database engines. Especially clustering applications in high dimensional ...

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This paper proposes a minimal but quite handy extension of SQL to express multiple top-k queries and proposes an optimized hash join strategy to efficiently ...

Dec 17, 2020 · Since, as you clarified, your sub-query is almost identical to your main query you might be able to use the window function RANK as a filter ...

We introduce a new rank-join algorithm that makes use of the individual orders of its inputs to produce join results ordered on a user-specified scoring.

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May 31, 2020 · This tutorial has two main objectives. First, we will explore and contrast the main assumptions, concepts, and algorithmic achievements of the two research ...

Jun 14, 2020 · ABSTRACT. Top-k queries have been studied intensively in the database community and they are an important means to reduce query.

When scanning multiple index lists (over attributes from one or more relations or document collections), top-k query processing faces an optimization problem: ...

In this paper, we propose an approach to optimize the evaluation of top- k queries over data services. We consider the worst case scenario when services provide ...