20 citations · 46 across the 13 of their papers we have counts for
13 papers · 1 filter
Temporal Data Exchange
Ladan Golshanara, Jan Chomicki
Data exchange is the problem of transforming data that is structured under a source schema into data structured under another schema, called the target schema, so that both the sou…
Prioritized Repairing and Consistent Query Answering in Relational Databases
Slawomir Staworko, Jan Chomicki, Jerzy Marcinkowski
A consistent query answer in an inconsistent database is an answer obtained in every (minimal) repair. The repairs are obtained by resolving all conflicts in all possible ways. Oft…
Semantics and Evaluation of Top-k Queries in Probabilistic Databases
Xi Zhang, Jan Chomicki
We study here fundamental issues involved in top-k query evaluation in probabilistic databases. We consider simple probabilistic databases in which probabilities are associated wit…
Consistent Query Answers in the Presence of Universal Constraints
Slawomir Staworko, Jan Chomicki
The framework of consistent query answers and repairs has been introduced to alleviate the impact of inconsistent data on the answers to a query. A repair is a minimally different…
Database Querying under Changing Preferences
Jan Chomicki
We present here a formal foundation for an iterative and incremental approach to constructing and evaluating preference queries. Our main focus is on query modification: a query tr…
Semantic Optimization Techniques for Preference Queries
Jan Chomicki
Preference queries are relational algebra or SQL queries that contain occurrences of the winnow operator ("find the most preferred tuples in a given relation"). Such queries are pa…