Preference formulas in relational queries
ACM Transactions on Database Systems (TODS)
On the revision of preferences and rational inference processes
Artificial Intelligence
Optimization of relational preference queries
ADC '05 Proceedings of the 16th Australasian database conference - Volume 39
Exploiting Indifference for Customization of Partial Order Skylines
IDEAS '06 Proceedings of the 10th International Database Engineering and Applications Symposium
Semantic optimization techniques for preference queries
Information Systems
Database querying under changing preferences
Annals of Mathematics and Artificial Intelligence
Journal of Artificial Intelligence Research
Contracting preference relations for database applications
Artificial Intelligence
A survey on representation, composition and application of preferences in database systems
ACM Transactions on Database Systems (TODS)
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Changing preferences is very common in real life. The expressive power of the operations of preference change introduced so far in the literature is limited to adding new information about preference and equivalence. Here, we discuss the operation of discarding preferences: preference contraction. We argue that the property of minimality and the preservation of strict partial orders are crucial for contractions. Contractions can be further constrained by specifying which preferences should not be contracted. We provide algorithms for computing minimal and minimal preference-protecting contraction. We also show some preference query optimization techniques which can be used in the presence of contraction.