Preference queries over sets

@article{Zhang2011PreferenceQO,
  title={Preference queries over sets},
  author={Xi Zhang and Jan Chomicki},
  journal={2011 IEEE 27th International Conference on Data Engineering},
  year={2011},
  pages={1019-1030}
}
We propose a “logic + SQL” framework for set preferences. Candidate best sets are represented using profiles consisting of scalar features. This reduces set preferences to tuple preferences over set profiles. We propose two optimization techniques: superpreference and M-relation. Superpreference targets dominated profiles. It reduces the input size by filtering out tuples not belonging to any best k-subset. M-relation targets repeated profiles. It consolidates tuples that are exchangeable with… CONTINUE READING
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