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02/17/2023
Efficient Approximation of Certain and Possible Answers for Ranking and Window Queries over Uncertain Data (Extended version)
Uncertainty arises naturally inmany application domains due to, e.g., da...
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04/06/2022
Computing expected multiplicities for bag-TIDBs with bounded multiplicities
In this work, we study the problem of computing a tuple's expected multi...
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03/24/2022
Efficient Answering of Historical What-if Queries
We introduce historical what-if queries, a novel type of what-if analysi...
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12/17/2021
Interpretable Data-Based Explanations for Fairness Debugging
A wide variety of fairness metrics and eXplainable Artificial Intelligen...
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04/26/2021
Provenance-based Data Skipping (TechReport)
Database systems analyze queries to determine upfront which data is need...
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03/29/2021
Putting Things into Context: Rich Explanations for Query Answers using Join Graphs (extended version)
In many data analysis applications, there is a need to explain why a sur...
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03/12/2021
To not miss the forest for the trees – a holistic approach for explaining missing answers over nested data (extended version)
Query-based explanations for missing answers identify which operators of...
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02/23/2021
Efficient Uncertainty Tracking for Complex Queries with Attribute-level Bounds (extended version)
Certain answers are a principled method for coping with the uncertainty ...
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01/31/2020
Approximate Summaries for Why and Why-not Provenance (Extended Version)
Why and why-not provenance have been studied extensively in recent years...
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03/30/2019
Uncertainty Annotated Databases - A Lightweight Approach for Approximating Certain Answers (extended version)
Certain answers are a principled method for coping with uncertainty that...
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02/13/2019
Snapshot Semantics for Temporal Multiset Relations (Extended Version)
Snapshot semantics is widely used for evaluating queries over temporal d...
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01/24/2019
HRDBMS: Combining the Best of Modern and Traditional Relational Databases
HRDBMS is a novel distributed relational database that uses a hybrid mod...
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08/16/2018
PUG: A Framework and Practical Implementation for Why & Why-Not Provenance (extended version)
Explaining why an answer is (or is not) returned by a query is important...
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04/17/2018
Heuristic and Cost-based Optimization for Diverse Provenance Tasks
A well-established technique for capturing database provenance as annota...
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07/31/2017