How to ConQueR why-not questions

@inproceedings{Tran2010HowTC,
  title={How to ConQueR why-not questions},
  author={Quoc Trung Tran and Chee Yong Chan},
  booktitle={SIGMOD Conference},
  year={2010}
}
One useful feature that is missing from today's database systems is an explain capability that enables users to seek clarifications on unexpected query results. There are two types of unexpected query results that are of interest: the presence of unexpected tuples, and the absence of expected tuples (i.e., missing tuples). Clearly, it would be very helpful to users if they could pose follow-up why and why-not questions to seek clarifications on, respectively, unexpected and expected (but… CONTINUE READING
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How to ConQueR why-not questions

Q. T. Tran, C.-Y. Chan
Technical Report http://www.comp.nus.edu.sg/tqtrung/conquertech.pdf, National University of Singapore, • 2010
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