A Top-k aggregate query, which is a powerful technique when dealing with large quantity of data, ranks groups of tuples by their aggregate values and returns k groups with the highest aggregate values. However, compared to Top-k in traditional databases,...
Top-k queries are widely used in analyzing and processing uncertain data. In the uncertain database, the xtuple consists a number of alternatives which are mutually exclusive, the independence still remains among the x-tuples. Probabilistic threshold ...
Efficient retrieval of the most relevant (i.e. top-k) tuples is an important requirement in information systems which access large amounts of data. In general answering a top-k query request means to retrieve the k-objects which score best for an ...
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