---
title: Database Querying under Changing Preferences
url: https://www.emergentmind.com/papers/0607013
type: paper
arxiv_id: '0607013'
arxiv_url: https://arxiv.org/abs/0607013
published: '2006-07-05'
categories:
- cs.DB
- cs.AI
---

# Database Querying under Changing Preferences

## Abstract

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 transformation approach which works by revising the preference relation in the query. We provide a detailed analysis of the cases where the order-theoretic properties of the preference relation are preserved by the revision. We consider a number of different revision operators: union, prioritized and Pareto composition. We also formulate algebraic laws that enable incremental evaluation of preference queries. Finally, we consider two variations of the basic framework: finite restrictions of preference relations and weak-order extensions of strict partial order preference relations.