Logical Foundations of Preference Queries.
Jan Chomicki · 2011
The notion of preference plays an increasing role in today’s information systems. In particular, preferences are used to specify which query answers are the best from the user’s point of view. In this article, we discuss the work done over the last 10 years in the context of preference queries to relational database systems. We focus on preferences that are specified logically. We show how such preferences can be embedded into relational query languages. By separating the preferences from the query, preferencespecific query evaluation and optimization techniques can be formulated and preference modification studied. We conclude with an outline of future prospects for preference research.